stripling
From Longman Dictionary of Contemporary Englishstriplingstrip‧ling /ˈstrɪplɪŋ/ noun [countable] old-fashionedYOUNG a boy who is almost a young man – sometimes used humorously about a man who is quite old SYN youthOrigin stripling (1300-1400) Probably from → STRIP2 + -ling; from the idea of being thin