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.
Of the centenarians evaluated in the research, most were optimistic and easygoing. Some evidence indicates that personality can change between the ages of 70 and 100, so it is not known whether the centenarians have maintained their personality traits across their entire lifespans.