Well the C64 was state of the art at one time. :)
This brings up a good point ... how long can one expect to
have the older computers running in the future. 20 years
30 years 50 years? Ben.
Many things are built to last a VERY long time, go no further than an
Apple IIe, after 20 years in a school, and 10 years in a closet
almost all boot right up.
What I see as the issue is how repairable when the unit eventually
fails is it. Take those darn Dallas battery/clock modules for
example, bears to fix.