Boys' and girls' sexual maturation follows the same time course of development.

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Boys' and girls' sexual maturation follow different time courses of development. Girls typically begin puberty between 8 and 13 years of age, with physical changes such as breast development and the onset of menstruation. Boys usually begin puberty between 9 and 14 years of age, with physical changes such as testicular and penis growth and the development of facial hair. While there is variation among individuals, the general sequence and timing of these events are different between boys and girls.

Boys' and Girls' Sexual Maturation Follows the Same Time Course