I hear that but what I am saying is that the cohorts whose longevity is being measured (ie, people dying now who were born in ~1950) grew up in an utterly diffe

I hear that but what I am saying is that the cohorts whose longevity is being measured (ie, people dying now who were born in ~1950) grew up in an utterly different world and did not spend their adolescence indoors avoiding the sun, they were mostly rural, agricultural, poor, and outdoors. We have no idea what the longevity of the current ~30yo urban east asian will be, but the lifestyle is so radically different than their grandparents that I don't think there's any value in connecting the two.