I used to play Yu-Gi-Oh. I still have a ton of cards. I am 40. I got into it because my son was into it. One time I took him to the card shop to duel and he got slammed by these other kids. He was maybe 7. So I took all of his spare cards and made up a deck and started to duel with him so he could get some practice and learn some strategy. He got a lot better, but then I got hooked on it for a while (but I only ever went to tournaments and stuff with him. I'm not a weirdo
). He is 13 now, and neither of us play any more. But it was a lot of fun.