King James Version
From thirty years old and upward even unto fifty years old, every one that entereth into the service, for the work in the tabernacle of the congregation,English Standard Version
from thirty years old up to fifty years old, everyone who could come on duty, for service in the tent of meeting--Catholic Public Domain Version
from thirty years and above, even to the fiftieth year, all who enter to fulfill the rituals of the tabernacle of the covenant