From the new book The Longevity Project here are Six Myths to Living Longer:
1. Marriage guarantees a longer life.
2. Taking it easy adds Years to your Life.
3. You can Worry yourself to Death.
4. More Degrees means more Years.
5. Friendly, outgoing people Thrive.
6. Jocks outlive Nerds
The authors found that the quality of conscientiousness may lead to a longer life. (Here's to all of us slightly obsessive, well organized people.)
Also, that exercising in your "middle years" is the most important.
Take the longevity quiz for yourself:
http://www.parade.com/health/quiz/longevity.html