Well. It turns out I've been to the country with the lowest life expectancy, Swaziland, at 31.2 years. If I was from there, I'd have about a 50/50 chance of being around right now.
earthtrends.wri.org/updates/node/2...
Below, you'll find links to lots & lots of data. It makes you register after a bit, but perhaps it's worth it?