My perception is that if you were to compare the 1970s kids to today, the 1970s kids would be closer to the traditional Harvard type of intelligence. They’d all be more “adult like”. A major factor I think is availability of paper, and having instructions written. Imagine if you will, back in the fucking 1920s when they were poor and paper was more rare than it is today. You had to develop the ability to remember stuff the teacher taught.

When I was a school student teachers always gave verbal instructions, followed by paper with instructions. You didn’t have to follow what the teacher said. So that’s one major factor I think that makes today’s kids more childlike compared to the kids from the 1920s.