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U.S. dementia cases may rise to 1 million per year by 2060 

Previous estimates of dementia risk may have been too low

Two elderly people, who are more at risk of dementia, sit on a rust-colored couch. One of them is holding a small child.

Nearly half of people in the United States will develop dementia after age 55, a new study predicts.

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By Meghan Rosen

Baby Boomers may drive a bigger-than-expected boom in dementia cases.

By 2060, 1 million U.S. adults per year will develop dementia, scientists predict January 13 in Nature Medicine.