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A comment on Average IQ scores seem to have been falling and population ageing may be why. Parent comment

Re:Average IQ scores seem to have been falling and populatio... by Ygg2 on Friday September 29, 2017 @11:28AM (#15366119)
Yeah, but you becoming dumber as you get older won't affect scores, assuming each generation is tested at same point in their life. That's why I asked about their method.
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Re:Average IQ scores seem to have been falling and populatio... by godshatter on Friday September 29, 2017 @06:28PM (#15369796)
They did talk in the article about how more subjects sitting for IQ tests are 60 or older, so they must do more than just test once in a person's life, or they have been branching out and testing more people.
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