Personality and loss of disability-free life years: people in the lowest 5% percentile of Conscientiousness have 6 fewer life years and 2.5 fewer healthy life years compared to those above median. Conscientiousness above median makes no difference.
Being low in Conscientiousness can cut your life expectancy by up to 6 years, about as much as high blood pressure and diabetes.
More evidence for the importance of personality in mortality risk