When, and why, must we die?

Life-extension zealots have championed many strategies aimed at prolonging our days here on Earth, and not all sound like much fun (I'm thinking specifically about caloric restriction). Supercentenarians - those rare humans who live beyond the age of 110 - by contrast seem to embrace much more appealing life-extension strategies: They routinely endorse regular naps, consumption of large quantities of chocolate, and a daily nip of strong drink, for instance.