life expectancy http://www.worldlifeexpectancy.com/usa/life-expectancy lowest life expectancy worldlifeexpectancy.com http://www.worldlifeexpectancy.com/usa/life-expectancy World Life Expectancy Organization USA Life Expectancy table USA Life Expectancy second lowest life expectancy USA Life Expectancy t about 78 years life expectancy life expectancy http://www.worldlifeexpectancy.com/usa/life-expectancy website USA life expectancy 78.61 years World Life Expectancy Organization