Meta-analysis of 92 longitudinal studies by Roberts, et al concluded all of the following EXCEPT
a. All six traits studied showed changes pas the age of 30.
b. Young adulthood (20-24) rather than adolescence appears to be the period in life when personality changes most.
c. Another critical period for personality change is the years after retirement from a significant job.
d. Except for Openness and Social Vitality all of the other traits became more positive with age.