Study finds menstrual periods are arriving earlier, especially among racial minority and lower-income individuals

The average age at menarche—the first menstrual period—has been decreasing among younger generations in the U.S., especially those belonging to racial minorities and lower socioeconomic statuses, according to a new study led by researchers at Harvard T.H. Chan School of Public Health. It also found that the average time it takes for the menstrual cycle to become regular is increasing.

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