2 Chronicles 26:1, 3-4

And all the people of Judah took Uzziah, who was sixteen years old, and made him king in the place of his father Amaziah.

Uzziah was sixteen years old when he became king, and he reigned fifty-two years in Jerusalem; and his mother’s name was Jechiliah of Jerusalem. He did right in the sight of the LORD according to all that his father Amaziah had done.