Girls are starting puberty a year earlier than in the 1970s, study
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Researchers found that the age at which girls begin to develop breasts has fallen by about three months per decade since the 1970s.
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Girls beginning puberty almost a year earlier than in 1970s, Children
Early puberty: Growing older sooner
TIL average onset of menstruation for girls in 1840 was age 17. In 2000 it was 12 years old. : r/todayilearned
Susan Perry, Author at MinnPost - Page 7 of 137
Puberty Starts Earlier Than It Used To. No One Knows Why. - The New York Times
Girls beginning puberty almost a year earlier than in 1970s, Children
Early puberty: Growing older sooner
Puberty Starts Earlier Than It Used To. No One Knows Why. - The New York Times
