FWIW, a teen/adolescent may not have a 'fully mature' brain (insofar as that means anything) but that does NOT mean they have an 'unfinished' or 'deficient' brain
It's like how a 25m tall Giant Redwood is technically only "half" grown, but only an utter fool would say "that's not a proper tree!"
@Garwboy it does mean they lack good judgment however.
