Josiah was eight years old when he began to reign, and he reigned thirty-one years in Jerusalem. His mother’s name was Jedidah the daughter of Adaiah of 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.