environmental influences on personality across the lifespan. Corrected environmentality did significantly increase with age, but this increase was modest and plateaued quickly. Of course, if the most dramatic changes in heritability and environmentality primarily occur in the first decade of life, then these analyses of only self-report data (which do not contain data from infancy and early childhood) may not be well-equipped to detect them. Finally, consistent with results of analyses of the entire dataset, analyses of only self-report data indicate that age-related increases in phenotypic stability are predominantly attributable to increases in environmental contributions (Figure S3). Analyses of only self-report data do indicate slight increases in genetic contributions with age. However, environmental contributions are still the predominant contributor to increasing phenotypic stability. Starting at age 9, the genetic contribution rises by .14 correlation units until it plateaus, but the environmental contribution rises by .31 correlation units.
