Well I am a few years yet from 56. I think it might have as much to do with work ethic than anything. A person mid fifties has set their ways and also in most cases has some plot of land or kids in college or is finishing up on a nest egg. Therefore they tend to be a more reliable worker.
Of course that is a stat so it will not apply to everyone some people have 30 years of bad work habits too.
I think for certain driving industry wise a person mid fifties is less likely to jump ship after a bad week while a younger person is more likely to swap companies and discover that the grass is greener because the dog craps in that spot.
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