Research shows that the prevalence of dementia has fallen in the United States (Washington Post)

After age 65, men and women spend more than a dozen years in good cognitive health, on average. And over the past decade, that time span has been expanding.

The Washington Post (in a Kaiser Health News story) highlighted research by Eileen Crimmins of the USC Leonard Davis School on how long older adults could expect to live with good cognition, mild cognitive impairment, and dementia. The article quoted Jennifer Ailshire of the USC Leonard Davis School on the limited relationship between personal happiness and cognitive decline and also noted a more recent study by Crimmins that found college graduates lived more cognitively health lives. The story also ran in Scientific American.