Reduce stress. Stay active. Maintain strong social connections. If you’re among the oldest people in the world, pretty much everyone you meet will ask you the same question: What’s the secret to living a long life? The answers given can vary from “morning walks and chocolate” to eating bacon every day. (I’m guessing being an Amazon Prime member will ultimately be a prerequisite.) But as those answers suggest, living a long time doesn’t necessarily make you an expert on longevity. While anecdotes and life tips are nice, what researchers really want is DNA. If you’re only 108 or 109 years old, you need not apply. But break 110 and scientists will be coming for your blood. From the NYT’s always interesting Amy Harmon: The Secret to Long Life? It May Lurk in the DNA of the Oldest Among Us.