Numbers 4:3
men from thirty to fifty years old—everyone who is qualified to serve in the work at the Tent of Meeting.
Berean Standard Bible
From thirty years old and upward even until fifty years old, all that enter into the host, to do the work in the tabernacle of the congregation.
from thirty years old and upward even until fifty years old, all who enter into the service to do the work in the Tent of Meeting.