Researchers examining menstrual cycles have identified several reasons why girls may experience early onset of menstruation. A recent study has revealed that children are beginning their periods at an earlier age, and the time it takes for their cycles to become regular is also changing.
These findings were published in the journal JAMA Network Open in May, 2024.
The data for this research was sourced from the Apple Women’s Health Study. The study involved researchers from the Harvard T.H. Chan School of Public Health and the National Institute of Environmental Health Sciences (NIEHS), with participation from the tech company Apple.
By analyzing menstrual cycle data from 71,341 individuals using iPhones and Apple Watches, researchers discovered that girls born between 2000 and 2005 are getting their first period at around 11.9 years old. In contrast, those born between 1950 and 1969 began menstruating at around 12.5 years old. The study highlights a decreasing trend in the age of first menstruation over generations, suggesting potential shifts in factors influencing the timing of puberty.
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