Even if the experimental drug isn't a cure, there's reason to believe something like it might ward off Alzheimer's disease in healthy people, sort of the way statins are thought to prevent heart attacks. And preventive therapy for the brain could help avert what many experts see as an impending disaster: By 2050, there will be 32 million people over the age of 80 in the U.S., and unless something big changes, about 16 million will have Alzheimer's disease.
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