Sadly, I missed out on the PC games of old. When I was younger, the closest thing to a computer that I owned was an Atari XE (which I still have, and love). Some of my friends had C64s, C128s, and one even had an older IBM, but I rarely got to play anything on them. My first PC came in 2001, by which time even Quake 3 was 'old'. But, little by little since then, I've been finding the games I missed out on. The Immortal, Nova 9, Stellar 7, Might and Magic 1-8, Silpheed, the first three Wing Commander games, MechWarrior 2, a good number of the FPSs that came out (Wolfenstein 3D to Blood)... stuff like that.
I've yet to venture into the old Lucas Arts adventure games though, as some of the prices that the more popular ones go for are ridiculous at times. Someday I'll take the plunge though.