I was never really interested in that kind of stuff (boy/girlfriends, sex), but I didn't have a word for it, it knew of other people who felt similarly until I was at a Pride Parade and was given a flier. Thinking "this is probably an add, but I'll read it anyway" I for the first time read about aces, and later read about aros aswell. So I learned about it in my early 20's.