I did not address this in the article bc 1) I think it’s pretty well known that there are wide disparities in age, wealth, and numerous other metrics when comparing countries of different levels of wealth, and much has ashtray been written on the subject. 2) There is not really a lifespan gap if you compare the middle class and the wealthy in the US…. Which can then lead us to generally think that all advances in longevity science might benefit great swathes of the population. My point is that may not be true.