The Levites thirty years of age or older were counted, and the total number of men was 38,000.

Numbers 4:3
men from thirty to fifty years old--everyone who is qualified to serve in the work at the Tent of Meeting.

Numbers 4:23
from thirty to fifty years old, counting everyone who comes to serve in the work at the Tent of Meeting.

Numbers 4:48
And the number of men was 8,580.

Numbers 8:24
"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.

1 Chronicles 23:2
Then he gathered all the leaders of Israel, as well as the priests and Levites.

1 Chronicles 23:24
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.

2 Chronicles 31:16
In addition, they distributed portions to the males registered by genealogy who were three years of age or older--to all who would enter the house of the LORD for their daily duties for service in the responsibilities of their divisions--

Now the Levites were numbered from the age of thirty years and upward: and their number by their polls, man by man, was thirty and eight thousand.