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The average age that a child reaches sexual maturity differs between the genders: Girls experience puberty between 8 and 13 years old and boys experience it between 9 and 14 years old, according ...
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]
Although there is a wide range of normal ages, females typically begin the process of puberty around age 10½; males at ages 11½—12. Puberty generally ends between 15—17 for females and 16–17 for males. [1] [2] [3] Females attain reproductive maturity about four years after the first physical changes of puberty appear. [13]
The average age of onset of puberty is 10–11 for girls and 11–12 for boys. [10] [11] Every person's individual timetable for puberty is influenced primarily by heredity, although environmental factors, such as diet and exercise, also exert some influences. [12] [13] These factors can also contribute to precocious and delayed puberty. [14] [13]
As puberty hits, boys are likely not thinking about children or how their current habits will affect their future fertility. Smoking, drug use, poor diet, obesity — these all can contribute to ...
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).
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.