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Although there is a wide range of normal ages, females typically begin the process of puberty around age 10½ and end puberty around 15–17; males begin around ages 11½—12 and end around 16–17. [1] [2] [3] Females attain reproductive maturity about four years after the first physical changes of puberty appear. [13]
Puberty is considered delayed when the child has not begun puberty when two standard deviations or about 95% of children from similar backgrounds have. [7] [8] [9]In North American girls, puberty is considered delayed when breast development has not begun by age 13, when they have not started menstruating by age 15, [2] and when there is no increased growth rate. [8]
Another study, which was published in 2024, found that the average age that girls had their first periods decreased from 12.5 years old in 1950 to 1969 to 11.9 years old in 2000 to 2005.
Upper body of a teenage boy. The structure has changed to resemble an adult form. Puberty is a period of several years in which rapid physical growth and psychological changes occur, culminating in sexual maturity. The average age of onset of puberty is 10–11 for girls and 11–12 for boys.
Starting puberty significantly early — younger than age 8 in girls, 9 in boys — may have health effects lasting into adulthood, including higher risks of breast cancer, diabetes and heart disease.
In girls, puberty and periods normally start between the ages of 10 to 15, but experts say this has been getting earlier in recent decades. In girls, puberty and periods normally start between the ...
Factors other than obesity, however, perhaps genetic and/or environmental ones, are needed to explain the higher prevalence of early puberty in black versus white girls." [18] While more girls are increasingly entering puberty at younger ages, new research indicates that some boys are actually starting later (delayed puberty).
Most of the voice change begins around puberty. [4] Adult pitch is reached 2–3 years later, but the voice does not stabilize until the ages of 21-25. It usually happens months or years before the development of significant facial hair. Under the influence of sex hormones (namely testosterone), the voice box, or larynx, grows in both sexes ...