Maskot/Getty ImagesLegally in this country you become an adult at 18, though anyone who has ever been that age and looks back now realizes they were still very much a child. For many of us, we didn’t magically get all our sh*t together in our 20s either. In fact, I think we can all agree your 30s and 40s are when your confidence really settles in, and you feel more grounded and stable in who you are than ever before. Well, a new study published in the journal Nature Communications found that there are five major “ages” in our brains’ lifespans — and the adolescent one lasts until age 32.Four t...

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