https://www.phoronix.com/news/Linux-6.16-SoundBlaster-AWE32
There is no strict guarantee of indefinite support, but that is often what happens.
But realistically, unless you're doing serious retrocomputing, it might never come up. I think most 20yo laptops, for example, will simply work with the latest Debian.
(I'm typing this on a 13yo laptop, because real keyboard, and everything works perfectly.)
Linux being open source completely enables that possibility where otherwise you'd be screwed.
Nothing. Nothing does.
If you still have the drivers handy - sure. I personally would trust older versions of Linux more than older versions of Windows though. And I say that as someone that is also typing this comment from a Windows desktop.
Newer old versions rely on Microsoft to activate them. Given the trajectory the indistry is moving toward, I don't have a lot of confidence that will last indefinitely.
More and more features these days are getting inextricably tied to the cloud, and it's becoming trickier to create offline installation media even for the ones that aren't.
The word "could" is doing a lot of heavy lifting here. If my 20+ year old HW doesn't work on my latest Ubuntu, then the word "could" offers me no comfort.
>Not so in the Windows world.
I can install 20+ year old drivers on Windows 11 no problem without the original author needing to change anything or any motivated individual picking up the slack.