Salaam everyone! I've got a question about making up for fasts I missed.

Assalamu alaikum wa rahmatullahi wa barakatuh! Eid Mubarak to all of you, and I hope you had a blessed and spiritually uplifting Ramadan. So, here's my situation-when I was much younger, I deliberately broke one of my Ramadan fasts by eating a grape. I honestly can’t remember exactly how old I was at the time, but I know I was really young, and I’m not sure if I had even reached puberty yet. Aside from that, I do have other fasts to make up for unintentional breaks, but this is the only instance I can think of where it was on purpose. My question is, do I need to do the 60 consecutive days of fasting to make up for it? I’ve heard that ruling only applies if someone is past the age of maturity, and I’m just not certain if I was. Honestly, I’m a bit confused about what I should do next.