Tanner stages 2-5: In boys, tanner 2 usually begins at ~12 years of age: the scrotum (the pouch containing the testes) will begin to thin and darken/redden; the testicles will increase in size; fine pubic hairs will start to appear at the base of the penis; one's body fat usually decreases, while the height gets taller by about 2-2.5 inches a year. Tanner 3-5 follows.
Answered 10/17/2016
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