An eight-decade study started by the late Stanford University psychologist Louis Terman in 1921 revealed some surprising characteristics of those who live long lives. Terman recruited 1,528 10-year-olds, half girls and half boys, and collected data on family histories and relationships, personality, hobbies, pet ownership, job success, education levels and more throughout their lives. Over a dozen of the subjects are still living.
Psychology professors Howard Friedman and Leslie Martin took over the project in 1990, and published a booked called The Longevity Project in 2011. What they found has changed the way they live.