1Now after these things, in the reign of Artaxerxes king of Persia, Ezra the son of Seraiah, the son of Azariah, the son of Hilkiah, 2 The son of Shallum, the son of Zadok, the son of Ahitub, 3 The son of Amariah, the son of Azariah, the son of Meraioth, 4 The son of Zerahiah, the son of Uzzi, the son of Bukki, 5 The son of Abishua, the son of Phinehas, the son of Eleazar, the son of Aaron the chief priest: 6 This Ezra went up from Babylon; and he was a ready scribe in the law of Moses, which the Lord God of Israel had given: and the king granted him all his request, according to the hand of the Lord his God upon him. 7 And there went up some of the children of Israel, and of the priests, and the Levites, and the singers, and the porters, and the Nethinims, unto Jerusalem, in the seventh year of Artaxerxes the king. 8 And he came to Jerusalem in the fifth month, which was in the seventh year of the king. (Ezra 7:1-8)
How old was Ezra when he came to Jerusalem?