American children are hitting puberty two to three years younger than they did 50 years ago.

Nov 8, 2026

Previously: American children are hitting puberty two to three years younger than they did 50 years ago. [Distorted]: Puberty is starting earlier, but not by two to three years. A 2020 worldwide meta-analysis found that the age when breast development begins fell about 0.24 years, almost 3 months, per decade from 1977 to 2013. That adds up to roughly a year over 50 years, and the age of first periods has moved much less. A large US study showing the average age of puberty onset has dropped by two years or more since the 1970s would prove this verdict wrong.

Now: American children are hitting puberty two to three years younger than they did 50 years ago. [Distorted]: Earlier puberty is a real trend, but this blanket number needs age, sex and a defined marker. A meta-analysis estimated breast-development onset falling 0.24 years per decade during 1977-2013. It did not establish that all American children begin puberty two to three years earlier than 50 years ago. Extrapolating its global trend to a different period is not a direct US estimate.

Deeper review against transcript context and primary evidence.