The average age at puberty has dropped from nearly 16 years old to 12 years old over the past 150 years.

Question

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This is true. According to a study published in the journal JAMA Pediatrics, the average age at which girls start developing breasts (a key marker of puberty) has fallen by almost three months per decade since the 1790s, from around 16-and-a-half years old to just under 10 years old. For boys, the average age of puberty has dropped from almost 15 years old to just under 12 years old.

The Average Age at Puberty Has Dropped from Nearly 16