Comment by heheocoenev

This seems intuitively correct. Neutrotisicm is associated with risk-averse behavior and thus less likely to engage in risky life-threatening activity. A highly neurotic personal can be paralyzed by enumeration of every conceivable outcome, and as such not ever do the dangerous thing. There seems to be a positive correlation of intelligence, so the individual may make long term conservative bets that further increase longevity.