If you can't defeat death, what if you could postpone it, or at least postpone the diseases commonly associated with getting old? Many people, especially the ultra-wealthy in Silicon Valley, are investing money into companies trying to answer exactly those questions. But people claiming to know what you ought to do to live longer isn't anything new. So what's real—because there really is new science worth being excited about—and what's just wishful thinking? Watch the video to find out more.