I have a windows xp desktop that I bought 9 almost 10 years ago and although it's slowing down it still works.
I'm actually typing this post on it.
Most people get rid of their desktop computers before they actually quit on them due to upgrades. I do have a newer computer but see no need to get rid of this old windows xp computer until it quits.
I also still have an old windows 98 desktop that still works flawlessly but I don't use it anymore due to it being so slow and only has a connection for dialup.
I still keep it around though as I like old computers. And I like to power it up once in awhile just for fun.