hmmm idk how to answer lol. I mean, my oldest is pokemon diamond but later i bought pokemon emerald, which is older an older game than diamond lol, but the cartridge isn't at all, because it was used just a bit when i bought it, while i literally spent more than 350 hours on diamond lol. and they both still work. Sometimes, i play my old pokemon diamond save just to have good memories and to check on my beloved Empoleon, who was my first pokemon and it's so so strong. my level 100 Empoleon defeated a level 70 Torterra 4real lol. Amazing. He was the first one to get to level 100 basically just loosing again and again to pokemon league lol. Trial and error. He has also basically almost any ribbon, so it's truly my special one. He's so special that he belongs to my first and favorite game which is Pokémon Diamond. I ll never transfer it from there to any other game and i ll keep my pokémon diamond cartridge safe from EVERYTHING lol