http://abcnews.go.com/Health/Wellness/pu...IZPgIY4EyE
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American boys appear to be maturing sexually at a younger age, a new study found.
Compared with studies going as far back as the 1930s, boys evaluated at well-child visits across the U.S. from 2005 to 2010 were growing pubic hair and achieving testicular enlargement 6 months to 2 years earlier, according to study author Marcia Herman-Giddens of the University of North Carolina at Chapel Hill, and colleagues.
There were some differences depending on race/ethnicity, with blacks entering puberty earlier than whites or Hispanics, the researchers reported online in Pediatrics. The study was published to coincide with the American Academy of Pediatrics' annual meeting in New Orleans.