Which is the oldest game you're still playing today :)

I still play Dark Souls 3 every couple of months even if i hate myself after. the gameplay is so satisfying when it finally clicks

I always find myself playing Pokmon Leafgreen and Emerald. Simpler times I suppose.

I still play some Gameboy Color games, such as the Pokemon TCG video game, and the Spyro games from PS2.

Prince of persia
I used play that on my 386 system. I used to play that until recently.

Roller Coaster Tycoon 2.
About every other year I get really into the game for months at a time. Then get tired and uninstall it.
Then the cycle repeats.

Rocket League or Sims, I would say overall but I sometimes dip back further with Spyro or Pokemon

Pokemon Diamond, and I'll keep playing it until it gets its long overdue remakes :p

Neopets! It was created in 1999 when I was only 4 xD I started playing when I was 10-11 years old when we got our first desktop. Been playing on and off, I always find my way back.

I think GTA San Andreas, but one of the Pokmon games might be older. I don't know.

Spyro trilogy for sure. Sometimes Sonic the Hedgehog was well!