Rollback - Robert J. Sawyer
In order to live long enough to receive a radio transmission from aliens inhabiting a planet 19 light years away (a thirty-eight-year round-trip response time), eighty-seven year old Sarah Halifax must take part in a "rollback" - a new technology that completely rejuvanates the human body to that of a twenty-five year old. She refuses to do this unless her husband of sixty years, Don, is also given a rollback. Trouble arises when Don's rollback succeeds and Sarah's fails. How will Don and Sarah deal with the vast age gap? What will it do to their marriage? Like Calculating God, Sawyer tells another compelling story about God, life, meaning, and hope. In this book the first contact with alien life is unlike any other. The first alien transmission is a series of multiple-choice questions on morality and ethics. Sarah realizes that "no one would bother sending a message across the light-years to tell you things. Rather, they'd send a message to ask you things" (100). You have to read the book to find out the reason why!