It seems a lot of astronauts, at least the early ones live long lives. I wonder if it was because the selection process weeded out anyone with any sort of health condition and anyone who was not at peak physical fitness.
It's people with very good baseline health, a lot of discipline in general to help maintain their health, decent enough privilege to lead easy/comfortable/healthy lives and retirements, and probably really good social lives. All things that help ensure long, healthy lives