Berean Standard Bible
Numbers 4:23
“From thirty to fifty years old, counting everyone who comes to serve in the work at the Tent of Meeting.”

In context
22“Take a census of the Gershonites as well, by their families and clans,
23From thirty to fifty years old, counting everyone who comes to serve in the work at the Tent of Meeting.
24This is the service of the Gershonite clans regarding work and transport:
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Berean Standard Bible · A modern, readable English translation. Public domain (CC0).