Peer pressure matters, and younger people are less able to select rationalist-compatible peers (due to less control over who their peers are).

I suspect younger people have short enough time horizons that they're less able to appreciate some of CFAR's ideas that take time to show benefits. I suspect I have more intuitions along these lines that I haven't figured out how to articulate.

Maybe CFAR needs better follow-ups to their workshops, but I get the impression that with people for whom the workshops are most effective, they learn (without much follow-up) to generalize CFAR's ideas in ways that make additional advice from CFAR unimportant.