Study Finds the Secret to Living a Long Life

Whenever someone turns 100, they're asked the same question: What's your secret? Some centenarians have said they follow a strict no smoking or drinking lifestyle, while others eat cookies and raw eggs and drink beer every day. One woman who lived to 109 even attributed her longevity to the lack of men in her life (girl, same). But a study from Harvard researchers may have found the actual--or at least, the most important--key to living a longer, healthier life.