Very few natives stay past age 30, most everyone else is from somewhere else so they generally planned to go back from where they came from the beginning (even those who can afford to stay) at least that is what I have seen.
Once you leave (and get established somewhere else) it is incredibly hard and expensive to move back, even from somewhere like NY where it is even more expensive generally.
Most the natives I know who have stayed have long since paid off their homes before retirement and you can’t get them to move. maybe I run with a small crowd however.
That is actually a big complaint in San Jose, Retiree’s don’t want to sell and move!!! LOL
The Natives I am talking about are boomer’s who originally bought their homes in the 80’s and 90’s and did not take all the equity out to buy new BMW’s (yes there are many believe it or not).