The body is the most fascinating machine ever created, and nobody talks about it in ways that are as illuminating and compelling as Dr. Michael Roizen and Dr. Mehmet Oz. Most people think of the aging of our bodies the same way we think of the aging of our cars: the older we get, the more inevitable it is that we're going to break down. Most of us believe that at age 40 or so, we begin the slow and steady decline of our minds, our eyes, our ears, our joints, our arteries, our libido, and every other system that affects the quality of life (and how long we live it). But according to Dr. Roizen and Dr. Oz, that's a mistake.