What's the oldest gen that still looks fine to you graphically?

[Pemalite]

Starting with the 4th gen/SNES era there were games that aged stupidly well... And others. Not so much.
Case in point: Donkey Kong and Killer Instinct have aged well. StarFox? Not so much.

On the Nintendo 64, Smash Brothers still looks decent. Golden Eye? Nope.

On the PS1, Final Fantasy 8 still looks great, mostly thanks to the pre-rendered backdrops.

So for me, it's not really the generation so much as the art and technical techniques used to render the games... Besides being a PC gamer you tend not to look at things in generations anyway.