New Revised Standard Version
In the second year after their arrival at the house of God at Jerusalem, in the second month, Zerubbabel son of Shealtiel and Jeshua son of Jozadak made a beginning, together with the rest of their people, the priests and the Levites and all who had come to Jerusalem from the captivity. They appointed the Levites, from twenty years old and upward, to have the oversight of the work on the house of the LORD.

Contemporary English Version
During the second month of the second year after the people had returned from Babylonia, they started rebuilding the LORD's temple. Zerubbabel son of Shealtiel, Joshua son of Jozadak, the priests, the Levites, and everyone else who had returned started working. Every Levite over 20 years of age was put in charge of some part of the work.

New American Bible
In the year after their coming to the house of God in Jerusalem, in the second month, Zerubbabel, son of Shealtiel, and Jeshua, son of Jozadak, together with the rest of their kinsmen, the priests and Levites and all who had come from the captivity to Jerusalem, began by appointing the Levites twenty years of age and over to supervise the work on the house of the LORD.

Douay-Rheims Bible
And in the second year of their coming to the temple of God in Jerusalem, the second month, Zorobabel the son of Salathiel, and Josue the son of Josedec, and the rest of their brethren the priests, and the Levites, and all that were come from the captivity to Jerusalem began, and they appointed Levites from twenty years old and upward, to hasten forward the work of the Lord.

And in the second year of their coming to the temple of God in Jerusalem, the second month, Zorobabel the son of Salathiel, and Josue the son of Josedec, and the rest of their brethren the priests, and the Levites, and all that were come from the captivity to Jerusalem began, and they appointed Levites from twenty years old and upward, to hasten forward the work of the Lord.

Zerubbabel.

Ezra 3:2 And Josue the son of Josedec rose up, and his brethren the priests, and Zorobabel the son of Salathiel, and his brethren, and they built the altar of the God of Israel that they might offer holocausts upon it, as it is written in the law of Moses the man of God.

twenty years old

Numbers 4:3 From thirty years old and upward, to fifty years old, of all that go in to stand and to minister in the tabernacle of the covenant.

1 Chronicles 23:24-32 These are the sons of Levi in their kindreds and families, princes by their courses, and the number of every head that did the works of the ministry of the house of the Lord from twenty years old and upward. . . .