21:1 twelve years old. Manasseh was evidently born three years after Hezekiah’s supernatural healing and God’s promise of a fifteen-year extension of his life (II Kings 20:6). Without this miracle, the Davidic line of kings in Israel would have been stopped, and God’s promise to David (II Samuel 7:12-16) would have failed. But God’s promises are sure, even if miracles are necessary to keep them!