Levites: Age of when Inducted Into office
Source: Nav
Numbers 4:3, 30, 47
men from thirty to fifty years old—everyone who is qualified to serve in the work at the Tent of Meeting. / from thirty to fifty years old, counting everyone who comes to serve in the work of the Tent of Meeting. / from thirty to fifty years old who came to do the work of serving and carrying the Tent of Meeting.
Numbers 8:23–26
And the LORD said to Moses, / “This applies to the Levites: Men twenty-five years of age or older shall enter to perform the service in the work at the Tent of Meeting. / But at the age of fifty, they must retire from performing the work and no longer serve.
1 Chronicles 23:3, 24, 27
The Levites thirty years of age or older were counted, and the total number of men was 38,000. / These were the descendants of Levi by their families—the heads of families, registered individually by name—those twenty years of age or older who worked in the service of the house of the LORD. / For according to the final instructions of David, the Levites twenty years of age or older were counted,
Ezra 3:8
In the second month of the second year after they had arrived at the house of God in Jerusalem, Zerubbabel son of Shealtiel, Jeshua son of Jozadak, and the rest of their associates including the priests, the Levites, and all who had returned to Jerusalem from the captivity, began the work. They appointed Levites twenty years of age or older to supervise the construction of the house of the LORD.