Oldest.... Would be my Pokemon Yellow. (I actually had yellow before red, lol.) Also I still have a Game called Revelations by Atlus. Not many people know about it I suppose....
Oldest game i've played: Pokemon Blue Oldest game i have: Super mario bros 3 Advanced 4 i think. Oldest steam game: Half life (original)
Well, I don't know exactly, but I still have a cartridge from the original game boy (and I still got a Game Boy Color...WORKING) that got some pretty strange games, like Ultraman demo (I think it's demo, it's in japanese, so after you defeat the...giant-robot-monster the game ends) and others that I don't remember now.Plus, it got Contra III.
i used to have pokemon yellow, but i sold it with my gba sp and my gba games, because i needed the money :'( . PS: pokemon diamond is a gameboy game, its just not for the original gameboy, but for gba
that will be pokemon yellow Oldest game I have is Ocarina Of Time (L) I had a Super Nintendo (SNES) when I was little, but I don't know what happened with it after I bought my N64
Pokemon Red and Yellow, those were the days where i would share the gameboy with my brother and we would play it together ;D
I don't know which one is older, I got Pokémon Red, Super Mario Land 6 Golden Coins and Ghostbusters.... For the GB, I have this one: Spoiler: Picture of my GB