What's the oldest Pokémon game cartridge you own?

Pokémon Blue. It still works and I still have the Game Boy Color I used to play it in. The thing is I just don't play it anymore because gen 1 is horrible and is easily the worst Pokémon generation.

Bought a bunch of second-hand ones so now my oldest are Ruby & Sapphire. One of which appears to possibly have an original save file so it is entirely possible there are 19-year old Pokémon!

If not, a pre-owned copy of Pearl has 2007 'mon!

Black 2, which my mom bought for me as a high school graduation present almost 10 years ago. The only Pokémon I kept from my first playthrough are a couple of Legendaries and an Excadrill I was particularly attached to (whom I recreated in my second Shield playthrough.)

If memory serves me well, that cart has no active save file at the moment. That might change soon even if it means I have to fight Ingo and Emmet as part of the storyline. I don't wanna take up arms against the twins! ;_;

An original Pokemon Blue cartridge. Both the cartridge and Gameboy Color I played it on are both older than me. I tried it out, but sadly has a tendency to freeze and lock up. Around the second gym my entire save deleted.

Pokémon Sapphire. I got it alongside my Game Boy Micro. Sadly, the saving isn't working anymore, so I've lost my original team.