2 Chronicles 34:1

Eight years old, was Josiah when he begun to reign, - and, thirty-one years, reigned he in Jerusalem.

Jeremiah 1:2

unto whom came the word of Yahweh, in the days of Josiah son of Amen king of Judah, - in the thirteenth year of his reign;

Zephaniah 1:1

The word of Yahweh which came unto Zephaniah, son of Cushi, son of Gedaliah, son of Amariah, son of Hezekiah, - in the days of Josiah son of Amon, king of Judah.

1 Samuel 2:18

But, as for Samuel, he was ministering before Yahweh, - a boy girded with an ephod of linen.

1 Samuel 2:26

But, the boy Samuel, went on growing in stature, and in favour, - both with Yahweh, and also with men.

1 Kings 3:7-9

Now, therefore, O Yahweh my God, thou, hast made thy servant king, instead of David my father, - and, I, am but a little child, I know not how to go out and come in.

1 Kings 13:2

And he made proclamation against the altar, by the word of Yahweh, and said, O altar! altar! Thus, saith Yahweh, - Lo! a son to be born unto the house of David, Josiah his name, who shall sacrifice upon thee the priests of the high-places, who are making a perfume upon thee, and, human bones, shall be burned upon thee;

2 Kings 22:1-20

Eight years old, was Josiah when he began to reign, and, thirty-one years, reigned he in Jerusalem, - and, this mother's name, was Jedidah daughter of Adaiah, of Bozkath.

1 Chronicles 3:14-15

Amon his son, Josiah his son.

2 Chronicles 24:1

Seven years old, was Joash when he began to reign, and, forty years, reigned he, in Jerusalem, - and, the name of his mother, was Zibiah, of Beersheba.

2 Chronicles 26:1

Then all the people of Judah took Uzziah, when, he, was sixteen years old, - and made him king, instead of his father Amaziah.

2 Chronicles 33:1

Twelve years old, was Manasseh when he began to reign, - and, fifty-five years, reigned he in Jerusalem.

2 Chronicles 33:25

But the people of the land smote all the conspirators against King Amon, - and the people of the land made Josiah his son king in his stead.

Ecclesiastes 4:13

Better a boy poor and wise, - than a king, old and stupid, who knoweth not how to take warning any longer.

Matthew 1:10-11

And Hezekiah begat Manasseh, and Manasseh begat Amon, and Amon begat Josiah;

Treasury of Scripture Knowledge

Summary

Josiah was eight years old when he began to reign, and he reigned in Jerusalem one and thirty years.

Bible References

Eight years

2 Chronicles 24:1
Seven years old, was Joash when he began to reign, and, forty years, reigned he, in Jerusalem, - and, the name of his mother, was Zibiah, of Beersheba.
2 Chronicles 26:1
Then all the people of Judah took Uzziah, when, he, was sixteen years old, - and made him king, instead of his father Amaziah.
2 Chronicles 33:1
Twelve years old, was Manasseh when he began to reign, - and, fifty-five years, reigned he in Jerusalem.
1 Samuel 2:18
But, as for Samuel, he was ministering before Yahweh, - a boy girded with an ephod of linen.
1 Kings 3:7
Now, therefore, O Yahweh my God, thou, hast made thy servant king, instead of David my father, - and, I, am but a little child, I know not how to go out and come in.
Ecclesiastes 4:13
Better a boy poor and wise, - than a king, old and stupid, who knoweth not how to take warning any longer.