henry copeland:
From nurture to nature -- heritability of intelligence increases with age. pllqt.it/ioojb3
Molecular Psychiatry - Genetics and intelligence differences: five special findings
It would be reasonable to assume that as we go through life, experiences—Shakespeare’s ‘whips and scorns of time’—have a cumulative effect on intelligence, perhaps overwhelming early genetic predispositions. However, for intelligence, heritability increases linearly, from (approximately) 20% in infancy to 40% in adolescence, and to 60% in adulthood. Some evidence suggests that heritability might increase to as much as 80% in later adulthood47 but then decline to about 60% after age 80.48- www.nature.com