Numbers 4:3

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.

from thirty years old and upward even until fifty years old, all that enter upon the service, to do the work in the tent of meeting.

from a son of thirty years and upward, even till a son of fifty years, every one going in to the host, to do work in the tent of meeting.

men from thirty to fifty years old—everyone who is qualified to serve in the work at the Tent of Meeting.