The Longevity Project analyzes one of the world's longest-lasting studies and draws surprising conclusions about the work ethic, happiness, love, marriage, and religious views of people who have lived long lives.

Longevity is a fascinating topic. It's a matter of health, but also of ethics.

The world is already suffering from the consequences of human overpopulation. Many people wonder if science and medicine should be limited, or if they should be allowed to help us live as long as we desire to.

We mostly think about biology when considering how long we'll live, but according to researchers, aging could happen mostly in our minds, depending on factors such as happiness, satisfaction, and stress levels.

In The Longevity Project, authors Howard S. Friedman and Leslie R. Martin make this argument, based on the results of the world's longest-running study, the Genetic Studies of Genius.