of gene-environment correlation are likely to recur routinely, such that their effects on psychological development are pronounced. Thus, the stability of nonshared environmental effects on personality, which only includes effects of environmental experiences that are not systematically related to genotype, might be expected to be relatively lower than that of genetic effects on personality, which additionally includes effects of environmental experiences that are systematically related to genotype. However, as discussed earlier, transitions to increasingly stable life roles that occur with age, would be expected to result in increasing nonshared environmental stability with age.
