A study published in 2020, which drew together multiple pieces of research to track the health of almost 50,000 over-65s, showed the incidence rate of new cases of dementia in Europe and North America had dropped 13 per cent per decade over the past 25 years — a decline that was consistent across all the studies.
For Albert Hofman, who chairs the department of epidemiology at the Harvard TH Chan School of Public Health, the research points to one conclusion: “The absolute risk [of developing dementia] is lower now” than it was 30 years ago. Now, there are early signs that the same phenomenon may be emerging in Japan, a striking development in one of the world’s most aged populations, suggesting that the downward trend is becoming more widespread…
While emphasising that the reasons for the reduction in incidence are not yet fully understood, Hofman believes better cardiovascular health is likely to be a significant factor given the proven links between the two.
Here is more from Sarah Neville at the FT. Maybe that is where the Flynn effect has been hiding!
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