According to data from Measure of America's Human Development study, citizens of different states have very differing average life expectancies, ranging from 75 to over 81 years. Hawaii has remained state with longest life span for quite some time. With an expectancy of 81.3 years, Hawaii exceeds national age of 79 by 2.3 years. Mississippi was ranked state with shortest life span out of all US territories. Their life expectancy at birth, 75 years, is four years below the country average.