10 to 13: Most girls have begun their periods by age 14. The average now is 11, which is earlier than a generation ago due to better nutrition and earlier sexual development in the usa. The closer one lives to the equator the earlier the start, and vice versa for the girls in countries in the extreme northern hemisphere.
Answered 8/4/2012
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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
A doctor has provided 1 answer
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