The average life expectancy in the U.S. is 78.5 years -- and by now we all know that certain healthy behaviors might help to extend that figure, whether it's exercise, nutrition, or little everyday habits, like cooking more meals at home.
But could your personality affect how many birthdays you celebrate? Maybe so, according to a body of research evaluating the role our outlooks can play in life span.
Of course, it's important to remember that many factors, from genetics to lifestyle, work together to determine life expectancy -- but researchers have found that these six personality traits, in particular, are more common in those who lead longer lives. Click through, then let us know what you think. Do you have any of the six?