2 Kings 11:21
Jehoash began to reign as king when he was seven years old,
2 Chronicles 24:1-14
Joash was seven years old when he began his reign, and he reigned forty years in Jerusalem. His mother's name was Zibiah. She was from Beer-sheba.
2 Kings 11:4
But during the seventh year of her reign, Jehoiada went out and called together the rulers of hundreds, the captains, and the guards, and assembled them together inside the LORD's Temple. He made a covenant with them, making them take an oath in the LORD's Temple, and then he revealed the king's son to them.
2 Kings 22:1
Josiah was an eight year old child when he began to reign, and he reigned for 31 years in Jerusalem. His mother was named Jedidah, the daughter of Adaiah of Bozkath.