adolescent, boy, fledgling, hobbledehoy (archaic) lad, shaver (informal) young fellow, youngster, youth
English Collins Dictionary - English synonyms & Thesaurus
stripling ( striplings plural ) People sometimes refer to a young man as a stripling when they want to indicate in a slightly humorous way that although he is no longer a boy, he is not yet really a man.
...a stripling of 20.
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