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Up to 4 in 10 people could develop dementia after 55. What you can do to lower your risk

About a million Americans a year are expected to develop dementia by 2060, roughly double today’s toll. WASHINGTON — About a million Americans a year are expected to develop dementia by 2060, roughly double today’s toll, researchers reported Monday. That estimate is based on a new study that found a higher lifetime risk than previously thought: After age 55, people have up to a 4 in 10 chance of eventually developing dementia — if they live long enough.…