> Most of compounding magic begins at ages 60-65, a time where most investors start to die out.

Percentage-wise, few wealthy investors are dying out at ages of 60-65. In the US, males that make it to age 60 have a life expectancy of 81-82. But that's across all men - life expectancy is strongly correlated with wealth in the US, so a man in the top 1% could very reasonably expect to live to very late 80s/90s.

Nevermind that Buffet was still fabulously rich when he was 60, so none of your logic makes any sense to me.