Life expectancy is, perhaps counterintuitively, not highly connected to health care. The major factors contributing to the gap between US and Canadian life expectancy are car accidents, homicides, and cardiovascular disease, and CVD differs wildly depending where you are in the country; there are states that lead the G7 in CVD outcomes, and others (like Mississippi and Alabama) that look like developing-world countries.

None of this is to defend the US system in particular, which wildly overspends on the outcomes it achieves. But generally, when it comes to managing chronic and acute health conditions, those outcomes are very good.