It is forty years into the future and, following decades of research and trillions of Euros spent on genetics, Europe is finally in a position to rejuvenate a human being. As the first subject for treatment, is chosen Jeff Baker - the father of the datasphere (which replaced the internet) and philanthropist extraordinaire. After eighteen months in a German medical facility, the seventy-eight-year-old patient returns home looking like a healthy twenty-year-old. Misspent Youth follows the effect his reappearance has on his family and friends -- his young ex-model wife Sue, his teenage son Tim, and also on his long-term pals who are now themselves all pensioners, and starting to resent what Jeff has become. Bestselling author Peter F. Hamilton has brought his unique story-telling skills to bear on an aspect of future living that is bound to increasingly fascinate.