Earlier Puberty: Age 9 or 10 for Average U.S. Boy
Boys are entering puberty at an average age of 10 among whites and Hispanics, and at an average age of 9 among African-Americans. About a third of boys start to mature sexually up to two years earlier than average.
The findings come from a study of 4,131 boys examined at doctors' offices across the U.S. by Marcia Herman-Giddens, DrPH, and colleagues. The same team found a year-earlier shift in first puberty for girls. Read more...
Puberty Starting Earlier in Boys, New Study Suggests - NYTimes.com
The study, which was to be announced at the Academy of Pediatrics national conference on Saturday and published online in the journal Pediatrics, did not try to determine what might be causing earlier puberty, although it mentioned changes in diet, less physical activity and other environmental factors as possibilities. Experts said that without further research, implications for boys are unclear.
Boys Starting Puberty Earlier, Like Girls
To assess puberty in boys, pediatricians measured two features: genital and pubic hair, and testicular enlargement, both standard indicators of start of
The results showed that puberty onset was happening some 6 months to two years earlier than it was several decades ago, according to records from that time.