Hormone replacement therapy might protect a woman's brain against Alzheimer's disease, but only if the timing's right, researchers say. Women who start hormone therapy within five years of menopause can lower their Alzheimer's risk by as much as 32%, researchers reported at the annual meeting of the American Neurological Association in Baltimore. But waiting to start hormone therapy until 65 or later increases a woman's risk of Alzheimer's, researchers found. "Starting hormone replacement