Joash was seven years old when he began to reign, and he reigned forty years in Jerusalem. His mother’s name also was Zibiah of Beersheba. (2 Chronicles 24:1)
This chapter dealing with the reign of Joash is parallel with 2 Kings 12. The same general order prevails, but here important details are added (vs. 3, 7, 15-22).
Seven years old.
This detail occurs as the last item of the preceding chapter in the record in Kings (2 Kings 11:21). The other details of the verse are the same as in 2 Kings 12:1, with the exception that the synchronism of the accession of Joash in the 7th year of Jehu is found only in Kings.