Charles Ellicott Commentary 2 Chronicles 34:1-2

"Josiah was eight years old when he began to reign; and he reigned thirty and one years in Jerusalem. And he did that which was right in the eyes of Jehovah, and walked in the ways of David his father, and turned not aside to the right hand or to the left." — 2 Chronicles 34:1-2 (ASV)

(1-2) Length and character of the reign.