Sure, eating right and exercising can lengthen your life. But there are some other factors at play too. Psychology Today polled doctors to find out which lifestyle factors help us live longer. Hereís what they found:

If youíre a guy who can have his pick of girlfriends, youíll live a few months longer than a guy who has to scrounge for dates, like in an area where the men outnumber the women. Thatís according to a Harvard study that looked at census data for 7 million men. What does getting your pick of girls have to do with longevity? When thereís less competition among men, thereís less stress. And when guys have to choose from a smaller pool of eligible women, they may get a quote, ďlow quality mateĒ and her poor health or lifestyle choices will rub off on the man, shortening his life.

Another longevity factor? Being born during a strong economy. People born during boom times live a year longer than those born in slumps. Two reasons: They have access to better nutrition and theyíre raised with less stress. And exposure to financial stress, even in the womb, increases heart-disease-related mortality.

Also, early exposure to stress can lead to irreparable neural damage.

Another life lengthening factor? Stressing out about the right stuff on the job. Bad stressors at work include worrying about the boss you donít get along with, or if youíre going to be fired. But good job stress is stuff like being challenged by a project. Because motivation and productivity can lengthen your life by about 4 years.