We are approaching a watershed moment in human history; a time when old people outnumber children and living to 100 is commonplace. There are major challenges associated with this dramatic and sudden increase in life expectancy, yet we must not lose sight of the fact that long life presents unprecedented opportunities. If we use science and technology to solve problems associated with aging and we develop new social norms and lifestyles, the entire life course can be redesigned in ways that dramatically improve quality of life at all ages.