He reached/entered 'puberty' later than most of his classmates.
(..) l mean, l work in the city in a job l don't understand, and everyone keeps getting promoted above me. l haven't had a girlfriend since-- well, since puberty. And... nobody fancies me. And if these cheeks get any chubbier, they never will. - Nonsense. l fancy you. - Really ? (..)1999 Notting Hill