Six longevity factors for senior citizens

Six factors are said to have key impacts on human longevity
(1) human relationship
(2) Personality, including these personality traits: have a positive attitude toward life and aging, out-going, optimistic, easy-going, sociable, expressive, with a strong sense of responsibility
(3) Career
(4) Healthy habits and lifestyle
(5) Stay away from unhealthy habit
(6) In company with healthy people