Genetics can affect any stage of life, and the steady pressure of existing genetics can have effects at a different time. If your informal argument was right, heritability of traits would never increase after puberty; for some things like intelligence, it does increase steadily over a lifetime.
Genetics can affect any stage of life, and the steady pressure of existing genetics can have effects at a different time. If your informal argument was right, heritability of traits would never increase after puberty; for some things like intelligence, it does increase steadily over a lifetime.