2 Chronicles 34:1
"Josiah was eight years old when he began to reign, and he reigned in Jerusalem one and thirty years."
Cross References (ranked by relevance)
To whom the word of the LORD came in the days of Josiah the son of Amon king of Judah, in the thirteenth year of his reign.
The word of the LORD which came unto Zephaniah the son of Cushi, the son of Gedaliah, the son of Amariah, the son of Hizkiah, in the days of Josiah the son of Amon, king of Judah.
Better is a poor and a wise child than an old and foolish king, who will no more be admonished.
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.
Manasseh was twelve years old when he began to reign, and he reigned fifty and five years in Jerusalem:
And he cried against the altar in the word of the LORD, and said, O altar, altar, thus saith the LORD; Behold, a child shall be born unto the house of David, Josiah by name; and upon thee shall he offer the priests of the high places that burn incense upon thee, and men’s bones shall be burnt upon thee.
But the people of the land slew all them that had conspired against king Amon; and the people of the land made Josiah his son king in his stead.
But Samuel ministered before the LORD, being a child, girded with a linen ephod.
Then all the people of Judah took Uzziah, who was sixteen years old, and made him king in the room of his father Amaziah.
And the child Samuel grew on, and was in favour both with the LORD, and also with men.