Ok, a little hyperbola. And some of it is due to ethnic makeup of the population.
But diet, pre/post natal care and screening for eg. cancer are the things that make a HUGE difference to life expectancy - not high-tech scanners and specialist brain surgeons. And these aren't things that are addressed by the US system.
No it doesn't.
http://en.wikipedia.org/wiki/List_of_countries_by_life_expec...
(Not disagreeing with your overall point.)