The following is compiled from the well-known Dunedin Multidisciplinary Health and Development Study and applies to cohort members at age 38.
I was most surprised to see the IQ variable included.
"The childhood IQ model also explains a low amount of wealth variation: again less than 2%. But IQ is also statistically
significant, with each extra IQ point gaining a person $5,600 more wealth at age 38."