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American Girls Reaching Puberty Earlier Than Ever »

Posted by: Neophile 3 months, 2 weeks ago

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If historical statistics are any guide, the average girl in northern Europe in the 1830s entered puberty -- defined by menarche, or the onset of menstruation -- at approximately 17 years of age. Today, chances are that her American counterpart will have her first period at about 12 and a half.