2 Chronicles 28:1

Ahaz was twenty years old when he began to reign, and he reigned sixteen years in Jerusalem: but he did not that which was right in the sight of the LORD, like David his father:

Ahaz was twenty years old - (see the notes at 2 Kings 16:1.) This prince, discarding the principles and example of his excellent father, early betrayed a strong bias to idolatry. He ruled with an arbitrary and absolute authority, and not as a theocratic sovereign: he not only forsook the temple of God, but embraced first the symbolic worship established in the sister kingdom, and afterward the gross idolatry practiced by the Canaanites.