Mid-pubescent

Luckily for Dwyane, he got the reassuring, mid-pubescent advice from new teammate LeBron James

Source: wiktionary

According to Savage, that was far from Hyneman's only unexpected solution. "Jamie was thinking that perhaps he might fly back in time to when he didn't have a beard but that solution is fraught with paradoxical contradictions," he explained. "Can't have Superman fighting General Zod as a mid-pubescent teen who's all powerful. That would be weird."

Source: wiktionary

My how... we've all grown! Especially Cera. He looks incredibly mid-pubescent here. But a very talented mid-pubescent actor, that is.

Source: wiktionary

The one-act musical comedy presents an eclectic group of six mid-pubescent students who are competing for first place in the spelling bee championship of a lifetime.

Source: wiktionary