> two most important factors in having successful children are: 1. having two parents and 2. having older parents at child birth. This ignores the genetic conf

> two most important factors in having successful children are: 1. having two parents and 2. having older parents at child birth. This ignores the genetic confounding. The reason "older parents" have "successful kids" is because those same parents have genes which make their kids successful. Decades of twin studies have shown that parenting really doesn't matter, but parents do (because of the genes they impart).