Varies: The average age of onset of menstruation is about 12.5 yrs, however in case of precocious puberty it can vary and be as early as a year or two. "precocious puberty is statistically defined as 2.5 to 3.0 sds below the average age of onset of puberty in healthy children--so age 5-6 years old is more typically seen than the 2-3 yr olds. The mean age of onset of puberty is about 10.5 years in girls.
Answered 5/14/2014
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