Meaning of 三つ子 in Japanese

Definition of 三つ子

みつご(mitsugo) 【三つ子】

みつごのたましいひゃくまで(mitsugonotamashiihyakumade) 【三つ子の魂百まで ·三つ子の魂百迄】

(exp) the child is father to the man; the soul of a child of three (is the same) at 100
三つ子の魂百までとは本当によく言ったものだ。
'The child is father to the man' is certainly well said.

三つ子の魂百までみつごのたましいひゃくまでとは本当によく言ったものだ。

'The child is father to the man' is certainly well said.