Age is just a number in many contexts, but when it comes to finding long-lasting love, an age gap between partners can greatly impact the course of the relationship -- both in positive and challenging ways. The Sugars discuss those so-called "May-December" romances with the help of Lucinda Franks, a Pulitzer Prize-winning journalist and author of the memoir "Timeless: Love, Morgenthau, and Me," which tells the story of her marriage to New York District Attorney Robert Morgenthau, who's 27 years her senior.