That would influence the life expectancy. It's rather questionable if it would influence the life expectancy of a population of 300,000,000 people by almost 2.5 years, but David Gratzer, senior fellow at the Manhattan Institute, only wrote an opinion piece, not some kind of scientific report. So, well.
But health care also influences infant mortality, and not only is life expectancy in the States lower - the infant mortality rate in the States is also
significantly higher than in Canada.
(4.63 in Canada vs. 6.37 in the United States - according to the
CIA World Factbook)