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Wiktionary
postpubescent

a. That occurs after puberty n. An individual who has passed puberty.

Usage examples of "postpubescent".

The Well World essentially reset newcomers, not to a childthat would have insulted their intelligence and been another hurdle to handlebut as a postpubescent young adult.

I should be dreaming of being in a normal body or having some postpubescent wet dreams about Kelly.