2 Chronicles 24:1

The son of seven years was Joash in his reigning, and forty years he reigned in Jerusalem. And his mother's name Zibeah from the Well of the Oath.

2 Kings 11:21-15

The son of seven years, Jehoash in his reigning.

1 Chronicles 3:11

Joram his son, Ahaziah his son, Joash his son,

Treasury of Scripture Knowledge

Summary

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.

Bible References

Joash

2 Kings 11:21
The son of seven years, Jehoash in his reigning.
2 Kings 12:1
In the seventh year to Jehu, Jehoash reigned; and forty years he reigned in Jerusalem And his mother's name Zibiah, from the Well of the Oath.