Age of Empires II, Baldur's Gate II: Shadows of Amn. The Baldur's Gate series (For the PC of course :V) is by far my most favorite game series. You start of as a level 1 weakling who basically, has to run away from even the weakest of foes in order to survive, but eventually as you get stronger you can go back and turn them all into stone or blow them up into a bajillion pieces, hahaha~. I dunno man, I just can't put that feeling into words. Revenge is damn sweet. I recently (As in today) started playing Grandia for the PSX.
Lineage 2 is about 10 years old now. And the first few chronicles were the best, awesome game. I like to play Diablo2 and Starcraft.
I guess that the only old game which I still play up to this day is Pac Man. It's a nice, classic game,
Sonic the hedgehog 1, 2 and 3 (Sega Mega Drive/Genesis) and Wonder Boy in Monster World (Sega Mega Drive/Genesis).
My old games is mario and dragon which i play till now. I like it very much becuase it is my childhood games .
The original starcraft and Counter-Strike Source. I can't play CS 1.6, the graphics just don't do enough for me.