Teenagers (ages 13-19) are usually adolescent, though in some individuals, puberty may extend a few years beyond the teenage years, and in some individuals, puberty begins in the pre-teen years.
Adulthood is generally understood as the time when physical maturation is complete. One reaches their maximum height and secondary sex characteristics form such as body hair and facial hair, voice lowers in pitch (especially noticeable in men), and menses begin (women).
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