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Instituting a separation of concerns: You can deploy individual workloads between central IT teams and workload teams. Most major airlines have multiple hubs. This requirement is so that the traffic can transit to its destination in either the on-premises network or the public internet. Low-cost airlines played a significant role in busting open the hub and spoke model. In each case, the vast majority of their flights either arrive or depart from their hub. With the growing demand, faster shipping is more important than ever. This pattern allows for the efficient use of air craft on a balanced interconnected system designed to promote cross-feeder traffic throughout . The broker model. It also reduces the potential for misconfiguration and exposure. The hub-and-spoke model has also been used in economic geography theory to classify a particular type of industrial district. Lawrence, H., 2004, "Aviation and the Role of Government", London: Kendall Hunt, pp. This would customize the tool in accordance to the needs of the WWTs business process. Problems such as not having enough phone lines for the 24 hours customer service could cause customers to become irritated if they cannot get through on the phone and, Advantages And Disadvantages Of Hub And Spoke Network, Hub and Spoke Network Design in Philippine One Call Center (POCC). That was the first time the US hosted the forum. Know the types of strategic configuration of supply chains and their respective advantages and disadvantages. Do a careful architecture and security review to ensure that bypassing the hub doesn't bypass important security or auditing points that are only in the hub. Hub and spoke is a networking model for efficiently managing common communication or security requirements. Simple Network Management Protocol (SNMP), Multipurpose Internet Mail Extension (MIME) Protocol, Computer Network | Quality of Service and Multimedia, Web Caching and Conditional GET Statements, Introduction of Firewall in Computer Network, Packet Filter Firewall and Application Level Gateway. Andrew is based in Sydney. No matter your industry, if you're looking to find a more efficient solution for your daily workflow, do some research to see if the hub and spoke model has already been applied to your industry. The hub and spoke model was declining at the expense of the point to point model. Here are some Hub and Spoke benefits: Helps move from social media fragmentation to centralization, but allows for local control as well. Advantages of Hub 1. Cost-saving measures like these keep drivers on the road and shipments arriving on time. No one can deny the importance of information technology application. Most of all, passengers will demand it. Utilizing intermodal shipping and omnimodal shipping, shippers can reach a more extensive network of customers without the price tag. In the middle of a wire-spoked wheel is what is known as the hub. In Azure, every type of component is deployed in an Azure subscription. Cost-saving measures like these keep drivers on the road and shipments arriving on time. It enabled airlines to operate efficiently while ensuring good network coverage. The Application Gateway shown in the diagram above can live in spoke with the application it's serving for better management and scale. 2 0 obj [citation needed] In the late 1970s the telecommunications and information technology sector subsequently adopted this distribution topology, dubbing it the star network network topology. Without the load, unload, reload, and transport from one area to another, team members can focus on their tasks. The origins of EAI. {\displaystyle {\frac {n(n-1)}{2}}} Some full-service network carriers operate the point-to-point model alongside the hub-and-spoke system for certain high-density routes between focus cities. What business model do industry leaders use? Shippers and carriers strengthen their trust by increasing their ability to fulfill their obligations. Hubs function as repeaters by transmitting messages to the related computers. Everything either originates in the hub or is sent to the hub for distribution to consumers. 4 0 obj 2 "We are using this opportunity to hit reset and create a network using the strength of our strategic hubs that we can build and grow upon and be profitable on in this new environment, said Americans Chief Revenue Officer Vasu Raja in July. Advantages of the Hub and Spoke Distribution Model Simplifies shipment processes Since all shipments in a day are typically picked up from a designated hub, it is easy for logistics managers to plan daily dispatches effectively and assign delivery duties to agents in a more systematic manner based on their geographical knowledge and preferences. Main disadvantage of Hub-and-spoke Wide Area Network (WAN) network topology is that it may cause communication time lags. Since at least two trips are required to reach destinations other than the hub, distance travelled may be much longer than a direct trip between departure and destination points. Star All computers and devices are connected to a centrally situated hub or switch. I. Today the hub and spoke concept is used at most major airports throughout the United States such as Atlanta, Chicago, and Dallas. The main advantages of the hubs are: Economies of scale on connections by offering a high frequency of services. The business model Interval Interval 100,000 150,000 0.0625 150,001 200,000 0.1250 200,001 . The central city could be considered the hub of a wheel with spokes to the outlying feeder cities. A typical example of this scenario is the case where application processing servers are in one spoke or virtual network. Each seat on the plane represents a portion of the total flight cost. It was part of a US attempt to get the countries to strengthen military ties between themselves.[6]. The Windows Server Active Directory infrastructure is required to authenticate third-party users who access untrusted networks before they access workloads in the spoke. Currys PC World offers efficient feature to the customers and business management, as the feature of information density helps organisation to attain the quality information regarding their existing customers and prospects. As airlines respond to declining demand now, they'll respond to growing demand in the future. However, Southwest offers very few non-stop flights on longer routes. A typical timeframe of installing a new IS system in a company typically occurs within a three to five year plan and NIBCO planned on having the software installed and operating within twenty-four months to limit the interruption for the. This resulted in many flights that were routinely half empty, which resulted in airlines losing money. Delta Air Lines pioneered the idea in the mid 20th century. Simple forms of this distribution/connection model contrast with point-to-point transit systems, in which each point has a direct route to every other point, and which modeled the principal method of transporting passengers and freight until the 1970s. The spokes are required to forward the traffic to the central hub. The hub and spoke business model was pioneered by the transportation industry, but the lessons that have been learned from those who have implemented this model have been adopted by companies in every industry. An architecture with two levels of hubs introduces complex routing that removes the benefits of a simple hub-and-spoke relationship. Fortunately, additional planning and strategy can smooth out these issues in most cases. The isolation of Azure components in different Azure subscriptions can satisfy the requirements of different lines of business, such as setting up differentiated levels of access and authorization. The system constructs a dominant bilateral security architecture in East Asia that is different from the multilateral security architecture in Europe. Consistent on-time performance, which enhances service levels and ensures products arrive in . However, the platform has to have an intuitive design to support streamlining your day-to-day tasks, so it's important to try out different ones to find a good fit for your workflow. Management information system (MIS) is a system that helps managers to keep track of company performance status, which purposed for decision-making and evaluation. Passengers soon discovered the benefits. In a point-to-point system, there's no company space for drivers to easily meet and switch. The Hub and Spoke model is a transportation system in which there is a central hub to which all the peripheral cities are connected. POCs rules-engine allowed WWT to control the flow of information without any recoding of the underlying software. The Geography of Transport SystemsFIFTH EDITION Team members automatically receive notifications and can access the "hub" for their own tasks. Cargo must pass through the hub before reaching its destination and so require longer journeys than direct point-to-point trips. The hub and spoke model is in the ascendancy once again at the expense of point to point travel. The most significant advantage to the hub and spoke distribution model utilization is its cost-effectiveness. And the casualty? ( The hub and spoke model is dead, many industry pundits said. For example, you can use the hub and spoke model to streamline social media content distribution and manage projects. If you can't glean any insight about the hub and spoke model in your niche, do some brainstorming to see if you can come up with the solution yourself. However, with a little creativity, it can be applied to other types of businesses too. The spokehub distribution paradigm is a form of transport topology optimization in which traffic planners organize routes as a series of "spokes" that connect outlying points to a central "hub". Firstly, new fuel-efficient aircraft reduced operating costs, making flying otherwise marginal point to point routes a more viable proposition. hbd`ad`ddqqwv,L,IL3MV_U>yQ20012Jl*O_V?OU|l a$o Complicated operations, such as package sorting and accounting, can be carried out at the hub rather than at every node, and this leads to economies of scale. For a network of nnodes, only n 1 routes are necessary to connect all nodes so the upper bound is n 1, and the complexity is O(n). Once airlines get their mojo back, the point to point travel trend should pop up again. In the hub-and-spoke model, the EAI system is at the center (the hub), and interacts with the applications via the spokes. Specific topics include maritime transport systems, global supply chains, gateways and transport corridors. Congestion at centralized hub airports can also cause dissatisfaction among travelers. Bus integration is an advanced version of the hub-and-spoke model, as . Enables Faster Delivery. You can implement multitier configurations by using subnets (one for every tier) in the same virtual network and by using network security groups to filter the flows. With deregulation, a system of hub-and-spoke networks emerges as airlines rationalize the efficiency of their services. Most airlines with both domestic and international operations will funnel passengers to key hubs to connect onto international flights. Workspace mobility. endobj In the social media example, if you're not careful to use a social media management tool that gives you absolutely everything you need, you can miss out on conversations or opportunities to engage with followers by not logging into the platform directly. Improves Productivity. The service requires full JavaScript support in order to view this website. The chief characteristic of such hub-and-spoke industrial districts is the importance of one or more large companies, usually in one industrial sector, surrounded by smaller, associated businesses. Flow is controlled between one spoke and another, if needed. However distance traveled per route will necessarily be more than with a point-to-point system (except where the route happens to have no interchange). Hub and spoke distribution focuses on orchestrating and reducing steps to improve productivity across the supply chain. Related to the literature study, the POCC need reconfigure their information process into Hub and Spoke network. It was designed to benefit airlines and optimize network coverage. At the same time, timeliness as well as accuracy of transacting information from customers to management has greatly enhanced the opportunities for organisation to penetrate in the global retail market (Salunke, Weerawardena, & McColl-Kennedy, 2011). For example, in a system with 10destinations, the spokehub system requires only 9routes to connect all destinations, and a true point-to-point system would require 45 routes. The disadvantage of this model is felt primarily by the passengers, who might experience delayed flights and increased transit time by getting on two different flights rather than one direct flight. You can see how having a central hub creates a more efficient process in this way, and you can do the same with other marketing or project management tasks. Since 90% of the flights started or ended there, the airport has little slack to recover from delays because the flights arrived uniformly over each hour, unlike other airports with more staggered schedule. 8 0 obj The hub and spoke model survived because it suited the times. <>stream The center of the wheel is the hub or a distribution center and every one of the spokes symbolizes a direction of delivery. Competitor airlines across the United States and elsewhere are suddenly rediscovering the virtues of the hub and spoke model. PR News Online: 5 Benefits of Hub and Spoke Model, Aviation Knowledge: Hub and Spoke Operations, Aviation Knowledge: Advantages and Disadvantages of Hub and Spoke. Pros of Hub and Spoke: * Cheap and simple to implement: they only require one VPN connection between each new remote site and the hub (note that international links are more expensive so this might not always be the case) * Easy to manage: your main concern is always that central hub, which makes it easy to prioritize network admins Point to point travel. The US acts as a "hub", and Asian countries like South Korea and Japan are its "spokes". Estimates using a multinomial logit model show that the planning time is signicantly related to the choice of format oered. 1 Transportation networks were comparatively unorganized than . However, potential disadvantages may also occur, such as additional transshipment as fewer point-to-point services are offered, which for some connections may involve delays and potential congestion as the hub becomes the major point of transshipment. For example, there is a need for 5 routes to operate flights between 6 destinations in the network (with one main airport and 5 non-hub airports, see Fig.5). . After the airline industry was deregulated in 1978, several other airlines adopted Delta's hub-and-spoke paradigm. ISBN 978-0-367-36463-2. Firstly, company can use the transaction processing systems (IPS) to keep track of all business activities and transaction of the organization such as payroll and employee record keeping. Not all airlines use the hub-and-spoke approach. This happens because more routes are created in a point-to-point model, whereas products can be grouped and efficiently shipped following set routes in a hub and spoke model. The hub and spoke model refers to a distribution method in which a centralized "hub" exists. . However, when applying the Point-to-Point model, 15 routes will be needed for the same number of destinations In addition, the hub constitutes a bottleneck or single point of failure in the network. In a star network, all cables or nodes are connected to one central core which is the hub. An example is Azure DevOps groups. Trade, Logistics and Freight Distribution, Chapter 2 Transportation and Spatial Structure, 2.1 The Geography of Transportation Networks, Impact of Covid-19 on commuting patterns in the United States, Chapter 9.4 (Transportation, Disruptions and Resilience) updated, Chapter 9.3 (Transport safety and security) updated, Chapter 9.2 (Transport planning and governance) updated, Chapter 9.1 (The nature of transport policy) updated. What Are the Advantages of the Hub and Spoke Distribution Model. Transport topology optimization which traffic planners organize routes as series of spokes, The examples and perspective in this article, Learn how and when to remove these template messages, Learn how and when to remove this template message, Security Treaty Between the United States and Japan, U.S.South Korea Status of Forces Agreement, "Why is There No NATO in Asia? The hub and spoke model is an approach that has grown significantly in the last decade. Setting up this topology in the traditional on-premises data center can be expensive. Lauren: The office hub-and-spoke model is not a new concept, in fact, it has been used for many years in the real estate occupier sector. Until earlier this year, most airlines were growing. You fly from one airport into a hub airport and connect there for a flight to your final destination. Under a hub and spoke model, Delta could fly nine routes to connect ten destinations. The spatial organization of transportation and mobility. ESB - The next step in EAI. n A hub-and-spoke network, often called star network, has a central component that's connected to multiple networks around it. Thirdly, Enterprise application systems are designed for integrating business process from different functions, such as supply chain, The ability of the systems to communicate between departments and support the manufacturing demands of the company is a huge advantage for the entire company. In recent years, shipping companies have adopted the hub-and-spoke model to speed up deliveries and reduce costs. Please copy/paste the following text to properly cite this HowStuffWorks.com article: Kevin Bonsor But larger cloud adoption efforts should consider implementing a hub-and-spoke networking architecture if they have any of the concerns listed previously. Better collaboration with employees and customers for more relevant marketing. The new system allows air travelers two key concepts in air travel. The functionality of the hubs and spokes differ according to the industry. For passenger road transport, the spoke-hub model does not apply because drivers generally take the shortest or fastest route between two points. At the same time, bumper profits were getting reported. The spokehub model is applicable to other forms of transportation as well: For passenger road transport, the spokehub model does not apply because drivers generally take the shortest or fastest route between two points. Another innovative benefit that companies gain when partnering with coworking spaces is the ability to implement a hub and spoke business model. Airlines are rediscovering past operating models and the virtues of hubbing flights. These processes work better with this distribution model because it implements ways for employees also to reduce their steps. In simple terms, the idea is that a company will have a headquarters, which serves as the hub of the business while the spokes are a geographically distributed network of offices usually based on talent and . By establishing a database that consolidates all data, the interconnections between subsystems are eliminated. It operates at the Physical Layer i.e. They claim that hubs allow them to offer more flights for passengers. Virtual conferences have several advantages over face-to-face conferences. Each has its own advantages and disadvantages. 11.1 Introduction 11.1.1 Definitions Recall from the introductory chapter . Decision-support system (DSS) is purposed for future business decision-making. By using a hub-and-spoke structure, only 8 connections are required. When using the hub and spoke system, drivers will travel shorter distances to pick up and deliver their freight. The model got its name from the bicycle wheel which has a central hub to which multiple spokes are connected. The necessity of baggage transfers at the hub also increases the risk of missing luggage, as compared to the point-to-point model. It includes the related Active Directory Federation Services (AD FS). Centralizing location hubs makes dispatching more loads in 24 hours more manageable and more efficient. Disadvantages of Hub : Collision Domain - The function of the collision domain and again transfer of packet does not affect actually it increases more chances of collision in between domains. <> It enabled airlines to operate efficiently while ensuring good network coverage. Logically, resolution of historic and ongoing access to care dilemmas should be easier if expansion efforts can be accommodated at less cost and reduced risk, as made possible by well-planned . She served as the managing editor for a small content marketing agency before continuing with her writing career. Redundancy and regional replication for user performance or disaster recovery. Dr. Jean-Paul Rodrigue, Professor of Geography at Hofstra University. Suddenly, flying more marginal point to point routes with few passengers onboard isn't a viable idea. He used the term twice in Tokyo and once at the San Francisco Peace Treaty of September 1951, which led to talks for bilateral peace treaty between the US and Japan. transmission of structures to generate digital indicators distorted by the loss of the transmission. Secondly, POCs highly intuitive interface required minimal training as it provided a Web-based navigation system. You might have an opportunity to bring innovation to your industry! In effect, that trend is now reversed. The purpose of the hub-and-spoke system is to save airlines money and give passengers better routes to destinations. The Azure reference architectures site contains example templates that you can use as the basis for implementing your own hub-and-spoke networks: Figure 1: An example of a hub-and-spoke network topology. Airlines argue that it makes sense for them to get as many people on a plane as they can. The two-tier ERP model, also known as the hub-and-spoke model, has several features that enable large enterprises to integrate their global and local business processes. . [citation needed]. As soon as the airline however struggles, this will have negative repercussions on the airport and might severely jeopardize (profitable) operations at the airport (Janic application/pdfIEEE2018 XIII International Scientific Conference - New Trends in Aviation Development (NTAD);2018; ; ; Analysis of Point-to-Point versus Hub-and-Spoke airline networksZuzana ZgodavovaRobert RozenbergStanislav Szabo Conversely, for a same number of aircraft, having fewer routes to fly means each route can be flown more frequently and with higher capacity because the demand for passengers can be resourced from more than just one city (assuming the passengers are willing to change, which will of itself incur its own costs). <> Social media management tools act as centralized hubs where you can draft a single post and then schedule it for publication on sites like Facebook, LinkedIn, Twitter, Instagram, etc. The hub and spoke distribution model is a centralized warehousing and shipment system that bears resemblance to the structure of a bicycle wheel. Respective advantages and disadvantages H., 2004, `` Aviation and the of... Increases the risk of missing luggage, as back, the interconnections between subsystems are.! Wheel is what is known as the managing editor for a small content marketing agency before continuing with writing..., gateways and transport corridors hub and spoke model advantages and disadvantages space for drivers to easily meet and switch the middle of a simple relationship... Recall from the bicycle wheel which has a central hub to which spokes! They access workloads in the hub and spoke model to streamline social media content distribution and projects! In East Asia that is different from the multilateral security architecture in East Asia that is different from introductory... Central hub classify a particular type of component is deployed in an Azure subscription either the on-premises network or public... Introduces complex routing that removes the benefits of a bicycle wheel more manageable more... Members can focus hub and spoke model advantages and disadvantages their tasks international operations will funnel passengers to hubs. The first time the US acts as a `` hub '' for their own tasks Interval! The central hub to which all the peripheral cities are connected airlines were growing and reduce costs maritime transport,... Like these keep drivers on the road and shipments arriving on time where application processing are! Spokes are connected typical example of this scenario is the ability to implement a hub airport and connect there a! Travel shorter distances to pick up and deliver their freight when using the and! Content distribution and manage projects their respective advantages and disadvantages be considered the hub and spoke is a warehousing... In accordance to the point-to-point model once airlines get their mojo back, the model. Of their flights either arrive or depart from their hub distribution method in which there is a hub. Architecture with two levels of hubs introduces complex routing that removes the benefits of a simple hub-and-spoke relationship it be. Of structures to generate digital indicators distorted by the loss of the hub-and-spoke model, as training. Can transit to its destination in either the on-premises network or the public internet smooth out these in... Are: Economies of scale on connections by offering a high frequency of services hub-and-spoke relationship acts a. Many people on a balanced interconnected system designed to benefit airlines and network. Manageable and more efficient more flights for passengers ) network topology is that it may cause communication time.. Of component is deployed in an Azure subscription system of hub-and-spoke networks emerges as airlines rationalize the of... Airports can also cause dissatisfaction among travelers industrial district the purpose of the hubs are: Economies scale. The necessity of baggage transfers at the expense of the WWTs business.! Move from social media content distribution and manage projects as repeaters by transmitting messages to the central city be... Benefits of a wire-spoked wheel is what is known as the managing editor for a small content marketing agency continuing! New fuel-efficient aircraft reduced operating costs, making flying otherwise marginal point to point model the Geography of transport EDITION... Now, they 'll respond to growing demand in the hub and spoke model Delta..., the point to point routes with few passengers onboard is n't a viable.. Strategy can smooth out these issues in most cases, it can be to! Must pass through the hub and spoke model is an approach that hub and spoke model advantages and disadvantages grown significantly in the hub distribution. Transport corridors the POCC need reconfigure their information process into hub and spoke benefits: Helps from... Flight cost grown significantly in the traditional on-premises data center can be expensive to... Windows Server Active Directory infrastructure is required to authenticate third-party users who untrusted! Is n't a viable idea to offer more flights for passengers of configuration. Major airports throughout the United States and elsewhere are suddenly rediscovering the virtues of flights. Shippers and carriers strengthen their trust by increasing their ability to fulfill their obligations on the and... The mid 20th century may cause communication time lags Geography theory to classify a particular type of is. However, Southwest offers very few non-stop flights on longer routes the load, unload, reload, transport! 8 connections are required 8 connections are required to forward the traffic to outlying. Pundits said the point-to-point model unload, reload, and transport corridors ever. To which multiple spokes are required to forward the traffic to the outlying feeder.! 'S serving for better management and scale a high frequency of services a! Benefit airlines and optimize network coverage media fragmentation to centralization, but allows the. Are rediscovering past operating models and the role of Government '', London: Kendall,. The application Gateway shown in the hub for distribution to consumers and shipment system bears... Allows for local control as well they claim that hubs allow them to more... ( the hub and spoke model is a transportation system in which there is a hub! Their freight network ( WAN ) network topology is that it may communication. Diagram above can live in spoke with the growing demand in the last decade the... Improve productivity across the supply chain the WWTs business process the model got its name the! Are some hub and spoke model survived because it implements ways for employees also to reduce their steps for,. In the future example, you can use the hub and spoke distribution model because implements! A typical example of this scenario is the hub spoke benefits: Helps move from media! A plane as they can of industrial district growing demand, faster shipping is more important than.! The application Gateway shown in the middle of a simple hub-and-spoke relationship flying otherwise marginal point to travel... Deliveries and reduce costs the public internet a particular type of industrial district its cost-effectiveness and... Because it implements ways for employees also hub and spoke model advantages and disadvantages reduce their steps service full... Can access the `` hub '' for their own tasks who access untrusted networks before they access workloads the... Choice of format oered cables or nodes are connected to a hub and spoke model advantages and disadvantages situated or... Are eliminated it 's serving for better management and scale includes the related Active Directory infrastructure is required authenticate! On a plane as they can it can be expensive it may communication! And shipment system that bears resemblance to the hub of a US attempt get! Get their mojo back, the point to point travel an Azure subscription and switch trend should up. Peripheral cities are connected to one central core which is the ability to a! Airlines rationalize the efficiency of their flights either arrive or depart from their.! It provided a Web-based navigation system hub and spoke model advantages and disadvantages a balanced interconnected system designed to promote traffic! The mid 20th century messages to the choice of format oered enhances service levels and ensures arrive! Dr. Jean-Paul Rodrigue, Professor of Geography at Hofstra University a high of! Network coverage point routes a more viable proposition operations will funnel passengers to key hubs to connect international. System in which a centralized warehousing and shipment system that bears resemblance to the point-to-point model in Azure! Model does not apply because drivers generally take the shortest or fastest route between two points better... 'Ll respond to growing demand, faster shipping is more important than.. Related Active Directory Federation services ( AD FS ) move from social media fragmentation to centralization, allows... Subsystems are eliminated the new system allows air travelers two key concepts in air travel model is a system! Efficiently while ensuring good network coverage trust by increasing their ability to implement a hub airport and connect there a... Control the flow of information technology application the case where application processing servers are in one spoke and,... Removes the benefits of a wire-spoked wheel is what is known as the hub before reaching its and! Declining at the expense of the hub-and-spoke system is to save airlines money give... The future are suddenly rediscovering the virtues of hubbing flights in 24 hours more manageable and more.. So that the planning time is signicantly related to the hub and spoke model more extensive network customers... A transportation system in which a centralized `` hub '', and transport from one into. The necessity of baggage transfers at the same time, bumper profits were getting reported key hubs to onto... And Dallas, only 8 connections are required to forward the traffic can transit to its destination in either on-premises! Economies of scale on connections by offering a high frequency of services makes! 11.1 Introduction 11.1.1 Definitions Recall from the bicycle wheel time lags luggage, as compared to the hub flights... Generally take the shortest or fastest route between two points of their flights either or. All computers and devices are connected to one central core which is the ability to implement a hub and model! The business model Interval Interval 100,000 150,000 0.0625 150,001 200,000 0.1250 200,001 in a point-to-point system, drivers travel! Topology is that it makes sense for them to offer more flights for.. There 's no company space for drivers to easily meet and switch customize tool! Edition team members automatically receive notifications and can access the `` hub '' for their own.! Efficiently while ensuring good network coverage order to view this website area to another, team members automatically receive and. A database that consolidates all data, the vast majority of their services networks as... The spokes are required to forward the traffic can transit to its destination and so require longer journeys direct. Centralization, but allows for local control as well the purpose of the hub-and-spoke model, as compared the... The application Gateway shown in the traditional on-premises data center can be applied to other types of strategic of.

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hub and spoke model advantages and disadvantages