King James Version
From thirty years old and upward even unto fifty years old, every one that came to do the service of the ministry, and the service of the burden in the tabernacle of the congregation,English Standard Version
from thirty years old up to fifty years old, everyone who could come to do the service of ministry and the service of bearing burdens in the tent of meeting,New International Version
All the men from thirty to fifty years of age who came to do the work of serving and carrying the Tent of Meeting