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Puberty begins at different ages for boys and girls ,on average. According to the American Academy of Family Physicians, puberty begins for girls between 8 and 14 years of age. For boys, the average is between 9 and 14 years. The stages of puberty are denoted by the advance of pubic hair for both boys and girls. For boys, the size of testicles is used to gauge the advance of puberty, and for girls, the size and contour of breasts are used.