Younger workers have less to lose, so tend to leave more — but they’re also less experienced and tend to have lower expectations for the workplace.
Older workers are less likely to leave because it’s disruptive, but they’re also more experienced at the political side of life — and tend to insist on things like reasonable hours, professional management, etc.
My personal stance is that trying to exploit your workers is a losing game — but from the employers who act that way...
There’s some who prefer the lower expectations (eg, Amazon) and some who prefer the more stable crew (eg, ATT).