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The longevity project was a long-term sociological study that began in 1921. Fifteen-hundred children were selected for the study, which continued for 80 years! A massive amount of data was collected on each of the study participants, yielding a treasure trove of information to be gleaned and organized. Paying close attention to the difference between "correlation" and "causation", numerous scholars, psychologists, and medical researchers have found some extremely interesting patterns in the factors that affect longevity. What sort of surprises? Conscientious people tend to live longer than care-free people. Being married doesn't help women live longer--but it does help men. Being religious, per se, does not assist longevity, but having lots of social connections in a religious congregation does. Both women and men who have feminine attributes live longer than those with masculine attributes. The early death of a parent has no statistical effect on longevity; but having parents who divorce has a significant effect.

All of these interesting results, plus many more are described in this book. In addition, there are many self-quizzes that help you to gauge where you fall in each area. This isn't really a "self-help" type of book. But it does shed light on the manifold factors that affect longevity.