I’m watching the below interview of Trump on Charlie Rose back in 1992 and I’m stunned by how much brighter he seemed back then.  His vocabulary is much more varied, his facts are much more detailed and precise,  his sentences more complex and less repetitive, his thoughts much more interesting, and he speaks much more quickly and fluently.

He was clearly in the top 5% of his age group back then (IQ 125+), possibly the top 1% (IQ 135+),  but sadly, I doubt he’s above the top 50% of his now much older age group (IQ 100+) unless he’s feigning stupidity for political or legal reasons.

This begs the question: What correlates most with lifetime success?  IQ in childhood, IQ in young adulthood, or IQ in old age?