In both childhood and adulthood, conscientiousness is the best personality predictor for a long life

Why do the conscientious stay healthier and live longer? First and most obviously, they are less likely to smoke, drink to excess, abuse drugs or drive too fast. They are more likely to wear seat belts and follow doctors' orders. The most intriguing reason why conscientious people live longer is that having a conscientious personality leads you into healthier situations and relationships. In other words, conscientious people find their way to happier marriages, better friendships, and healthier work situations. They help create healthy, long-life pathways for themselves.