At what average age does puberty typically begin for girls?

Puberty typically begins for girls around the age of 10.5 years. This average age can vary between individuals but most commonly, the onset occurs between 8 and 13 years of age.

Factors contributing to the variation in the onset of puberty include genetics, body composition, nutrition, and environmental influences. The process of puberty is marked by several physical changes, including the development of breast tissue, the growth of pubic hair, and the onset of menstruation, starting with thelarche (breast development).

The significance of this age range reflects a broader understanding of child development and the timing of hormonal changes that signal the beginning of adolescence. Knowing the average age of puberty onset helps healthcare providers screen for potential early or delayed puberty, which can have implications for further physical and emotional health.