This was part of the discussion back when Obamacare was being debated. Average life expectancy is not a very good metric for international comparisons. To take just one example, the U.S. stats are spiked by automobile accidents and homicides. U.S. healthcare outcomes jumped from near the bottom to the top of peer group countries when you control for that. The U.S. also spends much more on neo-natal and geriatric care; we do hip replacements on elderly people that the rest of the world would park in wheelchairs. We also have an adversarial legal system that drives prodigious waste due to defensive medicine to insulate against the lawyers. We also spend too much on futile high tech end of life stuff. It gets complicated.
Start by taking guns away from democrats and getting drunk drivers off the road.
Life expectancy isn’t a good measure. How you function at a given age, however, is a good measure.