It doesn't take much of a logical leap to associate it with the pressure put on the children taking the tests.
Presumably that kind of pressure ia coming to america.
Showing my age here, I guess. Fifty years ago, 18-year-olds in college were referred to as "men" and "women."
Nevermind that actual findings like https://www.sciencedaily.com/releases/2026/02/260218031606.h... and https://scitechdaily.com/your-brain-doesnt-magically-finish-... say something completely different.
Though auto-insurance claims do show some truth to late teens and early twenties drivers being...not mentally ready.
As a society we haven't really figured out how to talk about periods of life when there's more than "child" and "adult".
It is, of course, simpler and easier to just draw some arbitrary lines and treat everyone the same but I'm unconvinced that simpler and easier is the right metric here.