What you're talking about is called the Flynn effect. There're many studies indicating it's not just "starting to ease", it's getting reversed for today's teena

What you're talking about is called the Flynn effect. There're many studies indicating it's not just "starting to ease", it's getting reversed for today's teenagers (i.e. they're getting dumber). Here's a recent one for Norway: http://www.pnas.org/content/115/26/6674 http://www.pnas.org/content/115/26/6674