Hah. Me waaay older than you: I soldered the slots into the backplane of an Altair 8080 when I was a senior in College.

I had an Amiga 1000, later upgraded to a 2000. Great machine that was waaaay ahead of its time. It's main problem was that the earlier versions of the chips it used didn't have an MMU, which would have made memory management a lot easier. (Remember the easter egg in the Preferences menu, where you needed two people to hold down the keys while ejecting the floppy disk ("Amiga. Always a Champion."), and re-inserting it? ("We made the Amiga, but They F*d it up."))

I had a machine with dual 450 MHZ PIIs that first hosted the War College. My main machine then was a dual 1.13 GHZ PIII system. After a mobo blowout, I got a dual Athlon MP board (1 CPU so far, though) for my main machine, and rebuilt the old dual machine with a new Mobo using the PIII chips. The Dual 450 is a backup now.