Sure, but that wasn't the premise. Young people (< age 55) today have a far smaller share of current total wealth than young people did of total wealth in 1940.
And until 1940, each generation accumulated a greater share of value than the generation before. Post-1940, each subsequent generation has a smaller and smaller slice of the pie.
Isn't the thing that we should optimize for is human living standards improve and happiness increases?
The former (share of wealth) is a metric, while the latter (living standard and happiness) is outcome.
I know that for me, the outcome is what's important.
He never said living standards were better in the 40s.