Josiah was eight years old when he became king, and he reigned in Jerusalem thirty-one years. His mother’s name was Jedidah daughter of Adaiah; she was from Bozkath.
Concerning Josiah we are here told, I. That he was very young when he began to reign (Kg2 22:1), only eight years old. Solomon says, Woe unto thee, O land! when thy king is a child; but happy art thou, O land! when thy king is such a child. Our English Israel had once a king that was such a child, Edward VI.
Commenting on 2 Kings 22:1-10
Josiah was eight years old when he began to reign,.... And must be born when his father was but sixteen, for Amon lived but twenty four years, Kg2 21:19, and he reigned thirty and one years in Jerusalem; and so must die at thirty nine years of age: and his mother's name was Jedidah, the daughter of Adaiah of Boscath; a city of the tribe...
Josiah was eight years old - He was one of the best, if not the best, of all the Jewish kings since the time of David. He began well, continued well, and ended well.