How to Stop Time by Matt Haig

Rule number one - never fall in love. This seems like an understatement when you have the condition that Tom and others in the Albatross Society. They don't live forever but they do age so slowly compared to all those around them that they might as well live forever. This makes relationships difficult and as Tom finds out through his dealings with the Albatross Society - dangerous. Tom is forced to recruit or dispose of new members in hopes that the society will locate his daughter. Through plague, famine, war and adventure these few live many lives but all of them lonely. Reminiscent of "The Time Traveler's Wife" and the "The Curious Case of Benjamin Button" this is emotional time travel - how to cope with the pain and loss of near immortality.