I read somewhere years ago, that the reason life expectancy is lower in the US is because we calculate infant deaths from newborn on up, while other countries don’t factor in infant deaths until infants are 2 weeks old or more. That makes a huge difference, so in fact, our life expectancy is actually much higher than most countries.
Yeah, that’s not correct - the methodology is the same everywhere. What you might have heard though is something slightly different - the US has higher infant mortality than some other countries and that is a big thing that brings our numbers down. But you can control for that and there are other factors as well, including diabetes (obesity) and drug overdoses that lower US life expectancy relative to other countries.