Only on the "CBS This Morning" podcast, best-selling author, neuroscientist and cognitive psychologist Daniel Levitin joins co-host Gayle King to discuss his new book, "Successful Aging: A Neuroscientist Explores the Power and Potential of Our Lives." The book shows us how we can make the most of our lives as we age and Levitin explains why curiosity, openness, conscientiousness and healthy practices are the lifestyle choices that can have the biggest impact on the rest of our lives.