Schnitker and Emmons (2007) found evidence for an inverse relationship between patience and negative affect and between patience and depression, but a positive relationship between patience and self-reports of certain negative health outcomes, including headaches, acne, and ulcers.
They found that trait stability increased from a correlation .31 in childhood to .54 during the college years, to .64 at age 30, and then it reached a plateau around .74 between the from age 50 until the age of 70. What we can infer from these results is that personality seems to stabilize with increasing age.
Though typically antisocial personality disorder isn't diagnosed before age 18, some signs and symptoms may occur in childhood or the early teen years. Usually there is evidence of conduct disorder symptoms before age 15. Identifying antisocial personality disorder early may help improve long-term outcomes.