However, women's use of post-menopausal estrogen helps prevent and treat the disease. Alzheimer's disease affects some 4 million Americans today, and as the population ages, experts predict that it may strike as many as 8 to 10 million by the year 2020. But unless you carry certain very rare genetic mutations, you don't have to be one of them. Losing your car keys is no cause for alarm. The time to get concerned is when you find them, but have no idea what to do with them.
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