Isaiah 3:4

And now, O LORD my God, thou hast made thy servant king instead of David my father: and I am but a little child: I know not how to go out or come in. And thy servant is in the midst of thy people which thou hast chosen, a great people, that cannot be numbered nor counted for multitude. Give therefore thy servant an understanding heart to judge thy people, that I may discern between good and bad: for who is able to judge this thy so great a people?

Manasseh was twelve years old when he began to reign, and he reigned fifty and five years in Jerusalem:

Josiah was eight years old when he began to reign, and he reigned in Jerusalem one and thirty years.

Jehoahaz was twenty and three years old when he began to reign, and he reigned three months in Jerusalem.

Woe to thee, O land, when thy king is a child, and thy princes eat in the morning!