Association Between Menopausal Hormone Therapy and Alzheimer Disease Neuropathology
~39% lower odds of dementia associated with menopausal estrogen-only hormone replacement therapy. So not only is HRT safe if started early during menopause in terms of strokes and heart attacks, but apparently it may also lower dementia risk (or, maybe women who get HRT are better educated, are more affluent, and have better health habits, and are therefore less likely to get dementia).