Yes, buuut many will be players from 25 to 35 (with some degree of flexibility), that's why it's still an age thing. Yes, there are persons that are players for life, sure. But IME they are a minority.

Or maybe I'm just projecting, who knows?

Unexpected or deliberate change was an opportunity, a challenge, a stimulant! Job hopping (or hopping around relationships) when young can be about exploring the world, finding yourself and your values and isn't inherently bad.

Then you discover what you are good at doing and that you like doing and dedicating time to (or perhaps another person with whom you want to spend all your time) and your priorities change.

Then you might have kids and the work becomes more about financial security for the family then about your personal growth. And so you aren't looking at layoffs and unexpected change as opportunity because you are happy with what you've got.

It just often is an age or 'stage of life' thing for many people.

They are are more likely to set strong boundaries, demand fair compensation, and expect strong leadership. They are less willing to work nights and weekends, accept subpar pay, or tolerate workplace abuse, unlike younger, less experienced employees who may be more naive or eager to conform.