A woman's age at menopause is directly linked to a specific protein signature that accelerates brain aging.

Earlier menopause triggers a rise in pro-inflammatory pathways that physically age the brain's white matter. Blood tests show that these changes correlate with a higher risk of developing dementia later in life. Most people assumed the cognitive decline seen after menopause was just a general byproduct of getting older. These findings suggest that the loss of ovarian function sends a specific signal that damages the cells responsible for insulating brain signals. This biological clock provides a way to identify and protect women at the highest risk for memory loss decades before symptoms start.