'Sixteen year' in the Bible

Ahaz was twenty years old when he became king, and he reigned sixteen years in Jerusalem. He did not do what was right in the sight of the Lord his God, as his father (ancestor) David had done.

Ahaz was twenty years old when he became king, and he reigned for sixteen years in Jerusalem. He did not do right in the sight of the Lord, as his father (forefather) David had done.