I don't mind living a long life, as long as my health is good. But the way I've been grunting and groaning every time I get up from a chair or couch has me wondering just how long I'll be walking the earth. There is one country, however, that boasts the longest life expectancy on the planet of 90 years! No, it's not the United States. Our average life span is only 73 years, and for good reason.

Find out what country is on top, and find out why the U.S. lags behind by clicking here: