If Fifty is the new Thirty, then Nina Sullivan is today's pin-up girl. Blessed with good genes, she's keeping the crow's feet and laugh lines at bay, maximizing her youthful appearance. But, factor in her lackluster sex life and she's pushing a hundred.In the early years of their marriage, Nina and Sully consumed each other with raw, carnal passion. And then one by one, year by year, their children snuffed out the burning flames.Now that the kids...