age. However, it may also be the case that early gene-by-shared environment interactions for personality development are fleeting and give way to less genetically dependent environmental influence (e.g., Conley, 1984; Wolf & Weissing, 2012). If the effects of gene-by-shared environment interaction fade over time, then it would be expected that initially high levels of heritability would decline with age. Genetic stability would be low in early life while the effects of environmentally dependent gene expression weaken, but high later in the development.
