If you have macOS, it's supported until the OEM (Apple) stops supporting it. If you have Linux with some proprietary driver, it's supported until the OEM (e.g. Nvidia) stops supporting it. If you have Linux with open source drivers, it keeps working pretty much indefinitely.
Meanwhile 10+ year old hardware is serviceable for many uses. A 15 year old machine from the scrap heap could have 64GB of RAM, a different one could have a low idle power draw for a use where that's the only thing that matters. Put a cheap SSD in a machine of that vintage and someone who is just using web and email could keep using it for the rest of their life.
If you have macOS, it's supported until the OEM (Apple) stops supporting it. If you have Linux with some proprietary driver, it's supported until the OEM (e.g. Nvidia) stops supporting it. If you have Linux with open source drivers, it keeps working pretty much indefinitely.
Meanwhile 10+ year old hardware is serviceable for many uses. A 15 year old machine from the scrap heap could have 64GB of RAM, a different one could have a low idle power draw for a use where that's the only thing that matters. Put a cheap SSD in a machine of that vintage and someone who is just using web and email could keep using it for the rest of their life.