Also, an article from Slate noting that in Norway, IQ scores began declining in 1975: > What they found is that for Norwegians born between 1962 and 1975, IQs

Also, an article from Slate noting that in Norway, IQ scores began declining in 1975: > What they found is that for Norwegians born between 1962 and 1975, IQs increased within each family by 0.26 points per year: Younger brothers had slightly higher scores than their older siblings, relative to expectations. (The researchers had to control for the more general fact that older siblings tend to have higher IQs than younger ones.) From 1975 until 1991, this tendency reversed, with test scores dropping by 0.33 points per year within each family. https://slate.com/technology/2018/09/iq-scores-going-down-research-flynn-effect.html https://slate.com/technology/2018/09/iq-scores-going-down-re...