
Life expectancy in the U.S. is much higher, not the highest in the world, but it’s in the top quarter. The overall expectancy is 78.2 years, then 75.6 for men and 80.8 for women.
Swaziland is a small, landlocked country a bit smaller than New Jersey. There is a lack of water and it is also one country suffering from very high rate of HIV/AIDS infections, actually the highest rate in the world. Seventy percent of these people only live on less than one US dollar per day! That can give you a pretty good idea of why the expectance is so low..
http://en.wikipedia.org/wiki/List_of_countries_by_life_expectancy
https://www.cia.gov/library/publications/the-world-factbook/geos/wz.html


This is one more link to a different calculator if you would like to compare between the two calculators as I did.
http://www.peterrussell.com/Odds/VirtualAge.php
It does take a few minutes to do, but it’s so interesting!! It may not be all that easy for younger people to take it though, it looks at a few things that would be in the future for some, but you can still try and see.