IQ is a protective factor for some (but not all) forms of dementia [1]. Could the Flynn effect, by raising IQs, reduce the risk of some forms of dementia?

Immigration is another factor that could be increasing IQs, which in turn may decrease the incidence of dementia. Many countries have immigration programs that give preference to skilled professionals, who are likely to have above average IQs. Another immigration route which favours above average IQ is education-based immigration – come for university, stay after graduation.

[1] https://www.research.ed.ac.uk/portal/files/14297193/McGurn_D...