that number fails because it cannot predict medical advancements in the future, when they occur, and how they will benefit those currently alove, whether or not they can get them, when they become mainstream care procedures or drugs, etc...
needless to say as advancements continue those older life expectancy estimates get more and more inaccurate
For those born in 1950 and who are now 70, their expected remaining years of life are 15.6 for white Americans and 14.9 years for black Americans—7/10ths of a year difference. In 1950 a white baby was expected to live 7.4 more years on average than a black baby. So I think we are making progress. As for infant mortality, a certain percentage is from things like genetic abnormalities that can’t be helped, but it could be reduced further—the Scandinavian countries have an infant mortality rate about half that of the US.