The vast majority of problems do not manifest until late teen years or early twenties. Some serious mental illnesses hit after 25 and before 35.
This is a jobs bill for the psychology business. (Oh, and who is going to evaluate the psychologists? When I was in college all the ones I met were there trying to find out what was wrong with themselves.)
If you want to see what a really crazy person looks and acts like find a couple of psychologists to party with.