At about age 11 in girls and age 12 in boys,a surge of sex hormones triggers the onset of

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The onset of puberty is triggered by a surge of sex hormones in girls at around age 11 and in boys at around age 12. During puberty, physical changes occur, such as the development of secondary sex characteristics and the ability to reproduce, marking the transition to young adulthood. Gender typing, androgyny, and gender schemas are all related to gender identity and socialization, but are not directly related to the onset of puberty.

At About Age 11 in Girls and Age 12 in Boys,a