"I know what your son is to you and it frightens me. Let me explain a little. I don't think he'll change. At twenty-one or twenty-two, so many things appear solid and permanent and terrible. Which forty sees are nothing but disappearing miasma. Forty can't tell twenty about this. Twenty can find out only by getting to be forty."
January 1, 1970
https://en.wikiquote.org/wiki/The_Magnificent_Ambersons_(film)