From the Department of Underappreciated Facts

Career earnings growth in the U.S. more than doubled between 1960 and 2017, and the age of peak earnings increased from the late 30s to the mid-50s. I show that a substantial share of this shift is explained by increased employment in decision-intensive occupations, which have longer and more gradual periods of earnings growth…Experience takes longer to accumulate in high variance, non-routine jobs.

That is from a new working paper by David J. Deming.  One implication is that AI leads to lots of angry, frustrated, left-wing young people, and a cementing in of the gerontocracy.