The results of the continuous exponential models are largely similar. Heritability begins high in early life and declines to approach a lower asymptote of .34, whereas environmentality begins low and increases to approach an upper asymptote of .67 (.45 when corrected for measurement error). The asymptotic levels are approached rather gradually. At age 15, the models imply levels of heritability, environmentality and corrected environmentality of .59, .43 and .21, respectively. By age 30, the genetic and environmental influences on personality are still relatively far from their asymptotic levels with the estimate of heritability declining to .47, environmentality rising to .53 and corrected environmentality rising to .31.
