and peaked at a level only slightly less than that of genetic stability. Additionally, we found that genetic influences contributed to phenotypic stability at a relatively stable rate. In contrast, environmental contributions to stability changed substantially with age and accounted for the majority of increasing phenotypic stability in both the full and self-report analyses. By midlife, genetic and environmental effects were found to contribute almost equally to phenotypic stability. Effect sizes were very similar across different personality traits and measurement paradigms.
