三つ子の魂百まで (みつごのたましいひゃくまで): a leopard cannot change its spots; the child is father to the man; the soul of a child of three (is the same) at 100
三つ子の魂百まで
a leopard cannot change its spots; the child is father to the man; the soul of a child of three (is the same) at 100
What a child is at three, they still are at a hundred. Used fondly or wearily depending on which trait has just resurfaced.