'Twenty nine' in the Bible

Amaziah was twenty-five years old [when] he became king. And he reigned twenty-nine years in Jerusalem, and the name of his mother [was] Jehoaddan from Jerusalem.

Hezekiah became king when he [was] twenty-five years old, and he reigned twenty-nine years in Jerusalem. And the name of his mother [was] Abijah the daughter of Zechariah.