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Definition of Menarche
The average age of menarche varies among cultures and countries throughout the world and largely correlates with nutritional well-being.
In the United States the average age of menarche is 121⁄2; in rural regions of South Africa the average age of menarche is near age 14.
The age of menarche has declined worldwide by nearly a year over the past century, which health experts believe reflects improved nutrition and overall health status. Many cultures celebrate menarche as a rite of passage that ushers a girl into womanhood.
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