From thirty years old and upward until
fifty years old shalt thou number them; all that enter in to perform the
service, to do the work in the tabernacle of the congregation.
BSB
from thirty to fifty years old, counting everyone who comes to serve in the work at the Tent of Meeting.
WEB
you shall count them from thirty years old and upward until fifty years old; all who enter in to wait on the service, to do the work in the Tent of Meeting.
YLT
from a son of thirty years and upward, till a son of fifty years thou dost number them, every one who is going in to serve the host, to do the service in the tent of meeting.