Up to 4 in 10 Older People Could Develop Dementia. But You’re Not Powerless

WASHINGTON — About a million Americans a year are expected to develop dementia by 2060, roughly double today’s toll, researchers reported on Jan. 13.

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.

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It’s a sobering number, but there are steps people can take to reduce that risk, such as...