Study: 1 in 7 over 70 suffer dementia

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Nearly 15% of seniors age 71 and older have dementia of some sort - and nearly two-thirds of those have Alzheimer's disease, a new analysis suggests.

That is equal to about 3.4 million Americans with dementia of some kind, according to the National Institutes of Health-sponsored study. It is the first to estimate rates of dementia and Alzheimer's disease using a nationally representative sample of seniors across the country, researchers said.

The analysis was part of the Aging, Demographics and Memory Study (ADAMS), which itself is a part of the larger Health and Retirement Study (HRS). Findings were published online this week in "Neuroepidemiology."