2 Kings 11:19-21

Amplified Bible

¹⁹ Then he took the captains of hundreds, the Carites (royal bodyguards), the guard, and all the people of the land; and they brought the [young] king down from the house of the Lord, and came by way of the guards’ gate to the king’s house. And [little] Joash sat on the throne of the kings. ²⁰ So all the people of the land rejoiced and the city [of Jerusalem] was quiet. For they had put Athaliah to death with the sword at the king’s house.

^21 [a]Jehoash (Joash) was seven years old when he became king.