In the USA, data indicates that Hispanics on average have the longest life expectancy.
I Googled this statistic, and it is correct; however, it explained it with some possible correlations that I do not accept as the only valid explanations. One correlation is the close support of family for those that get sick. Another was that they may have fewer smokers in their demographic. Well, what about the possible correlation that perhaps there are enough poor Hispanics that do not drive, so they do not pull down the longevity statistics (aka, "average") with car accident casualties?
The false correlation that some might conclude from such a statistic is that they have a more robust genome oriented to longevity. I sort of doubt that personally.
What some might want to know is that before U.S. society made artificial demographics of Caucasian, Hispanic, African-American, etc., etc., is there a common denominitor for those long-lived individuals genetically? And, whether that genomic common denominator hails from one part of the globe? That might be the way to discern whether longevity is nature or nurture to a greater or lesser degree. The government explanation only focuses on "nurture." I believe it has something to do with "nature" also.