According to my credit report, I got my first credit card when I was 13 years old.
My mother made me an authorized user on her Kohl’s store credit card account, and she never closed it. I might have bought a few pieces of clothing for myself in high school with that card, but I don’t think I’ve even seen it in the last decade. And despite never using it and it only having a $2,500 credit limit, that credit card has been extremely beneficial to me as an adult.