Raising a child is one of the most difficult things you will ever do. When you're 46 years old, it's even tougher. In this updated version of his book, Mark Lenahan shares his experiences as the middle aged, first time father of Sean during his first year and looks forward to what they can both expect in the future. In other words, from the first time Daddy changed Sean's diaper to the first time Sean will change Daddy's diaper.