1 Chronicles 23:3-5
The Levites thirty years of age or older were counted, and the total number of men was 38,000. / “Of these,” said David, “24,000 are to oversee the work of the house of the LORD, 6,000 are to be officers and judges, / 4,000 are to be gatekeepers, and 4,000 are to praise the LORD with the instruments I have made for giving praise.”

1 Chronicles 23:24-27
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 David had said, “The LORD, the God of Israel, has given rest to His people and has come to dwell in Jerusalem forever. / So now the Levites no longer need to carry the tabernacle or any of the articles for its service.” ...

1 Chronicles 23:32
So the Levites were to carry out the responsibilities for the Tent of Meeting and the Holy Place, and, under their brothers the descendants of Aaron, the service of the house of the LORD.

1 Chronicles 28:13
for the divisions of the priests and Levites, for all the work of service in the house of the LORD, and for all the articles of service in the house of the LORD:

1 Chronicles 28:21
The divisions of the priests and Levites are ready for all the service of the house of God, and every willing man of every skill will be at your disposal for the work. The officials and all the people are fully at your command.”

2 Chronicles 31:17
and to the priests enrolled according to their families in the genealogy, as well as to the Levites twenty years of age or older, according to their responsibilities and divisions.

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.

Leviticus 25:50
He and his purchaser will then count the time from the year he sold himself up to the Year of Jubilee. The price of his sale will be determined by the number of years, based on the daily wages of a hired hand.

Leviticus 27:7
And if the person is sixty years of age or older, then your valuation shall be fifteen shekels for the male and ten shekels for the female.

Job 32:6-7
So Elihu son of Barachel the Buzite declared: “I am young in years, while you are old; that is why I was timid and afraid to tell you what I know. / I thought that age should speak, and many years should teach wisdom.

Psalm 92:14
In old age they will still bear fruit; healthy and green they will remain,

Luke 2:37
and then was a widow to the age of eighty-four. She never left the temple, but worshiped night and day, fasting and praying.

1 Timothy 5:9
A widow should be enrolled if she is at least sixty years old, faithful to her husband,

1 Timothy 5:17
Elders who lead effectively are worthy of double honor, especially those who work hard at preaching and teaching.

1 Corinthians 9:13-14
Do you not know that those who work in the temple eat of its food, and those who serve at the altar partake of its offerings? / In the same way, the Lord has prescribed that those who preach the gospel should receive their living from the gospel.