Jehoiachin was eighteen years old when he became king, and he reigned in Jerusalem three months. His mother’s name was Nehushta the daughter of Elnathan of Jerusalem — 2 Kings 24:8, NKJV
(Jehoiachin was eighteen (18) years old when he became king)

   Contradicted by:   

Jehoiachin was eight years old when he became king, and he reigned in Jerusalem three months and ten days. And he did evil in the sight of the Lord — 2 Chronicles 36:9, NKJV
(Jehoiachin was eight (8) years old when he became king)