The continuous exponential models are largely consistent with the lifespan trends as indicated by the connected-linear models. Each model indicated growth across the lifespan with an upper asymptote of .71 for phenotypic stability, 1.0 for genetic stability, .54 for environmental stability and 1.01 for corrected environmental stability. Growth in phenotypic, genetic and environmental stability was largely concentrated at early ages. The models indicate that phenotypic, genetic and environmental stability are .55, .82 and .42, respectively, by age 15. At 30 years of life, the expected phenotypic, genetic and environmental stability will have nearly approached their asymptotic levels and are predicted to be .64, .94 and .50, respectively. Thus, consistent levels of stability are predicted across adulthood and old age. Corrected environmental stability, on the other hand, continues to rise throughout the lifespan. At age 15, the true environmental correlation across time is expected to be .52, and at age 30 it is expected to be .69. True environmental stability continues to rise at age 45 (expected rE = .81) and age 60 (expected rE = .88) and does not reach the predicted asymptote by age 90 (expected rE = .96).
