Re:IQ decline and Piaget: Does the rot start at the top? [pdf]
by Apocryphon on Tuesday January 04, 2022 @01:55PM
(#29798510)
There was also this study of Mensa members, but that's probably an extreme outlier group.
https://www.sciencedirect.com/science/article/pii/S016028961...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3705611/