This seems a good topic for this group!
Makes a difference to uh . . . mortality. But I think we all know that, really.
JAMA Network | JAMA Internal Medicine | Feeling Old vs Being Old: *Associations Between Self-perceived Age and Mortality
Too bad we can't see the whole article for free, but the first page pretty much tells the story. I subscribe, so I've read the whole thing.
How old do you feel compared to your calendar age?