Berean Standard Bible
Numbers 4:3
“Men from thirty to fifty years old—everyone who is qualified to serve in the work at the Tent of Meeting.”

In context
1Then the LORD said to Moses and Aaron,
2“Take a census of the Kohathites among the Levites by their clans and families,
3Men from thirty to fifty years old—everyone who is qualified to serve in the work at the Tent of Meeting.
4This service of the Kohathites at the Tent of Meeting regards the most holy things.
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Berean Standard Bible · A modern, readable English translation. Public domain (CC0).