All good things must come to end. That's even true for smartphone software updates.

On Tuesday, Google updated its Nexus handset support page to detail when certain models of its Nexus smartphones will stop getting software updates. This means that after a particular device is "retired," Google will not update that particular device with the latest version ofAndroid, its mobile operating system.

Since 2010 Google has been selling Nexus devices, designed to showcase the company's latest Android software. The Nexus smartphones and tablets run what many refer to as "pure Android" software, which is stripped of additional software loaded onto it by device manufacturers or wireless carriers. One of the benefits of owning a Nexus device has been the guarantee that users will get the latest version of the Android software as it's released. This is not the case for other Android devices often sold through wireless operators, which can wait months to get updates.

But even Google can't support older hardware forever. Google is now giving its Nexus users a much clearer picture of how long their specific hardware will be supported. Check out the chart below to see which devices will be retired when. Users of older devices may still be able to get new Android updates by manually "flashing" or updating their devices with a custom ROM.