When Puberty Starts: Girls vs. Boys

Stages of puberty for girls: Typically girls show signs of puberty 2 years earlier than boys. Thelarche (breast development), adrenarche (pubic hair development), pubarche (growth), menarche (first period/menses) The average age for greatest growth/height velocity in a girl is 12.1 years old (with a range of 10.4-13.9 years). It is normal for a girl to start her period somewhere between the ages of 9 and 16. Stages of puberty for boys: Enlargement of the testes, lengthening of the penis, appearance of pubic hair, physical growth The average age for greatest growth/height velocity in a boy is 14.1 yrs old...

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