'Older' in the Bible

In the second year after their coming to the house of God at Jerusalem, in the second month, Zerubbabel son of Shealtiel and Jeshua son of Jehozadak began [their work], and the remainder of their brothers the priests and the Levites and all who came from the captivity to Jerusalem. They appointed the Levites {from twenty years and older} to direct the work of the house of Yahweh.