The onset of menstruation, or menarche, usually occurs between ages 10 and 14, with the average in the U.S. at 12. Research shows that starting periods earlier can lead to long-term health risks. Specifically, girls who begin menstruating at age 11 or younger face a heightened risk for cancers, particularly hormonally sensitive types like breast cancer. Family history plays a significant role in the age of menarche, with daughters often mirroring their mothers’ experiences. Environmental factors influencing this trend remain poorly understood but are being explored.
"The average age in the U.S. most recently has been around age 12. But in some recent studies, it has actually dipped even to 11."
"Menarche or first period at age 11 or lower was associated with a higher risk for any cancer, particularly those that are hormonally sensitive, like breast and endometrial cancer."
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