12.5 years: The average age for the onset of menstruation is 12 years and 6 months of age. Some girls/women begin having periods earlier and some later, the average is 12.5 years.
Answered 11/20/2014
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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