Sunday, May 27, 2018
Health

Dementia rates dropping even as population ages

Despite fears that dementia rates were going to explode as the population grows older and fatter, and has more diabetes and high blood pressure, a large nationally representative survey has found the reverse.

Dementia is actually on the wane. And when people do get dementia, they get it at older and older ages.

The new study found that the dementia rate in Americans 65 and older fell by 24 percent over 12 years, to 8.8 percent in 2012 from 11.6 percent in 2000.

In 2000, people received a diagnosis of dementia at an average age of 80.7; in 2012, the average age was 82.4.

"The dementia rate is not immutable," said Dr. Richard Hodes, director of the National Institute on Aging. "It can change."

And that "is very good news," said John Haaga, director of the institute's division of behavioral and social research. It means, he said, that "roughly a million and a half people aged 65 and older who do not have dementia now would have had it if the rate in 2000 had been in place."

The study, published online Monday by the journal JAMA Internal Medicine, included 21,000 Americans 65 and older across all races, education and income levels, who participate in the Health and Retirement Study, which regularly surveys people and follows them as they age.

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