@Ken: There is evidence
Citation absent in memory, Probably from New Scientist or BBC so apply preferred salt levels. Article suggested that the brain cell "pruning" that takes place during adolescence does reduce decision making competence as you hypothesize. Consequences assessment goes from bad to crap for 5 years or more. I do note from personal experience that tribal societies _increase_ rules and restrictions on their children approaching and during adolescence which anecdotally supports this theory.