From the mythical fountain of youth to modern cryogenics, the desire to extend our lives runs deep in the human psyche. Peruse any magazine stand and you’re likely to find a dozen ways to maximize your stay on planet Earth. Some are obvious: eat healthy, exercise, and don’t abuse yourself with drugs and alcohol. Other solutions are a bit more surprising: drink green tea, eat dark chocolate, and own a pet or two. Even more counterintuitive (and perhaps less self-congratulatory) than enjoying chocolate, a recent study suggests that longevity is also linked to your readiness to forgive those who harm you.