Merck Manual

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Milestones in Sexual Development for Girls and Boys
Milestones in Sexual Development
Milestones in Sexual Development for Girls and Boys

During puberty, sexual development occurs in a set sequence. However, when the changes begin and how quickly they occur vary from person to person.

For girls, puberty begins around age 8 to 13 years and lasts about 4 years.

For boys, puberty begins around age 10 to 14 years and lasts about 3 years.

The chart shows a typical sequence and normal range of development for the milestones of sexual development.