Rollback by Robert J Sawyer

An interesting, bittersweet novel about early life extension technologies. The main plot centres on a married couple. She was the person who deciphered the first message received from extraterrestrials, but is now 87. A response is received and she is offered a new (and phenomenally expensive) rejuvenation treatment to aid her efforts to decipher the alien's second message. She accepts, but only on the condition that her husband also gets the treatment. Unfortunately, it only works on him. The novel is from his point of view and explores the various effects that this has.

Good.