Some machines might last longer than us but they are still subject to the same laws of thermodynamics. Most computers from 20+ years ago are inoperable today; show me a machine that can survive millions of years.
Mostly because they were dismantled or destroyed. Most computers that old that were left unmolested still work just fine.
To get most old computers working, you have to surgically replace all capacitors first.
20 years is really stretching it, when it comes to the life of cheap capacitors anywhere in the lower latitudes.