Originally Posted by Whoopsmybad

On the pilot side I disagree completely. Everyone talks about the astronaut physicals in other countries. There is truth to it having talked to people I fly with now that came from international carriers. So those people are presumably a lot healthier (either genetics or harder work at it because of their standards) than the average American pilot just to get a medical. tracking their decline as they get closer to 65 is probably not going to look as bad as it would be in the US just due to the high bar just to hold their version of a Class 1 to start with.
So yeah, you have to know what your control group is in a study.