Jeffry S. Life, M.D., Ph.D., is the bestselling author of The Life Plan and Mastering the Life Plan. At a vibrant seventy-five years old, he is in great shape, still practicing medicine, and at the top of the healthy aging field. In 2012 Men’s Fitness magazine chose him as one of the top twenty-five fittest men in the world. He has been featured in The New York Times, Los Angeles Times, and Esquire magazine, as well as national TV shows, including The Doctors, Steve Harvey, and The Dr. Phil Show. His private practice is located in Las Vegas, Nevada, where he lives. His website is DrLife.com.