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In the United States, the age of onset of puberty in girls depends heavily on their racial background. Delayed puberty means the lack of breast development by age 12.8 years for White girls, and by age 12.4 years for Black girls. [7] [8] The lack of menstruation by age 15 in any ethnic background is considered delayed. [8]
The definition of the onset of puberty may depend on perspective (e.g., hormonal versus physical) and purpose (establishing population normal standards, clinical care of early or late pubescent individuals, etc.). A common definition for the onset of puberty is physical changes to a person's body. [13]
[18] While more girls are increasingly entering puberty at younger ages, new research indicates that some boys are actually starting later (delayed puberty). [ 21 ] [ 22 ] "Increasing rates of obese and overweight children in the United States may be contributing to a later onset of puberty in boys, say researchers at the University of Michigan ...
The average age of puberty’s onset — ranging from ages 8 to 13 for girls in the U.S. — has been dropping by about three months every decade over the last 40 years, according to a 2020 ...
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.
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 ...
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]
Lifestyle changes may also play a role. A new study shows a spike in early puberty in girls during the onset of the pandemic, which disrupted healthy habits for many. The researchers found that ...