Because healthcare is but one of a zillion factors that influence life expectancy?

Fair point.

I still doubt that it is the extra cost of caring for elderly people really well that is the major factor that is keeping the other costs high though. Especially since there are less very elderly people, as a percentage of population, than in other developed countries.

Because people have to reach old age before they get "leading healthcare for the elderly"; the ones that don't reach old age cause low ranking in life expectancy charts.

Because we're also the fattest and least healthy (diet & exercise) of the nations with high per capita income and moderately high life expectancy.