Albert Barnes Commentary 2 Chronicles 22:2

"Forty and two years old was Ahaziah when he began to reign; and he reigned one year in Jerusalem: and his mother`s name was Athaliah the daughter of Omri." — 2 Chronicles 22:2 (ASV)

For “42,” read “22” (see the marginal reference). Ahaziah’s father, Jehoram, was only 40 when he died (2 Chronicles 21:20).