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Puberty starts earlier than it used to. Nobody knows why

By Azeen Ghorayshi
New York Times·
10 mins to read
Puberty starts earlier than it used to. Nobody knows why
Studies in dozens of countries show the age of puberty in girls has dropped by about three months per decade since the 1970s. A similar pattern has been seen in boys. Photo / Jyotirmoy Gupta, Unsplash