What are the oldest video games you can enjoy?

My first dedicated gaming system was the PS1, and in general I have no trouble going back to the sprites and chunky polygons of the mid-to-late 90s, whether on consoles or computers

spoileras long as I can upscale them to 1080P

Beyond that it gets a bit hit and miss- SNES and Mega Drive games look and sound fine to me and I’ve played plenty of 16 bit console games as an adult. On PC, I can enjoy 2D stuff like Sam & Max Hit the Road or the original X-Com but most early 3D, like the original System Shock, looks a bit too much like visual vomit.

Going to 8-bit, while the vast majority of NES games are too primitive to my eyes and ears, I have no problems with Game Boy/Game Boy Color games.

spoiler(Well, at least the good ones, mostly made by Nintendo)

Is it just nostalgia because I had a GBC as a kid or is it because Game Boy games came later and had more developed visual aesthetics? thinking-about-it

My limit is probably the very late 80s