March 29, 2019, HealthDay News 

A new study suggests that the fewer menstrual periods a woman has in her lifetime, the higher her risk of dementia — though the reasons, for now, are unclear. The study was based on close to 16,000 women. It found that those who started having periods at age 16 or later were more likely to develop dementia than women who started menstruating at a more typical age. The same was true of women who went through menopause relatively early. 

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