Exercise probably helps to sustain your life more then any other factor. It allows us to have more focus, energy, and relaxation because it reduces stress. The second most important factor in prolonging your life is probably a sense of humor. Laughing also deactivates stress hormones and aids the immune system. People with a developed sense of humor tend to be more creative and more adapt at solving the many problems that life gives us. It improves many cognitive functions. Most of all, it helps people get along with others.