I think that if I were to rank the people I knew in high school and college by intelligence, the order would be the same at age 21 (before anyone started grad s

I think that if I were to rank the people I knew in high school and college by intelligence, the order would be the same at age 21 (before anyone started grad school) as it would be at age 28 (after most people have finished grad school). The people who were smart in high school are still smart today, regardless of their credentials. Some of the smartest people I know have PhDs, and some do not.