Good news! Probably due to better medical treatment options, medical diagnostics, earlier prevention and healthier lifestyles.
"The risk of developing dementia increases with age, so as the US population has grown older, dementia has become more common.
However, adjusting for age reveals an opposing trend. After analyzing long-term studies on tens of thousands of elderly Americans, a group of Duke University scientists found that, over the past 40 years, the age-specific prevalence of dementia has fallen by an astounding 67 percent.
The charts from their paper (below) show the share of the population with dementia on the vertical axis, with 5-year age groups extended chronologically on the horizontal axis.
On the left, each line represents a snapshot in time. You can see that dementia has become less common in every age group since 1984. ...
A similar trend has been documented in Europe."
Dementia by generation. "Lower Every Generation? Over the last 40 years, the percentage of people at a given age who have dementia has dropped by two-thirds, hinting that incidence has gone down over time."
"Dementia by Birth Year. People born in 1945 had much less dementia at a given age range than did those born in 1895."
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