For much of human history, mankind has faced a battle for existence over a short life and in the face of food scarcity, diseases and a constant threat of violence. As life has extended and people have become richer, especially those living in the advanced economies, so they have evolved to a situation where, for the majority, their children are safe and educated, work provides some financial security, and they can enjoy a retirement with some components of leisure. As life extends even further, people will be forced to move away from the lockstep of the three-stage life and face many more options about how they live their lives. A hundred years provides more time than required by the evolutionary imperative to breed, and more time in which to meet any financial security needs. So what is the purpose of these extra years if not to procreate and accumulate? Might these extra years, distributed throughout a life, bring the time and opportunity to explore who you are and arrive at a way of living that is nearer to your own personal values and hopes than to the traditions of the society into which you were born? If so, then this is perhaps the greatest gift that longevity can bestow.