Parallel
Numbers 4:30
King James Version (1769 Blayney revision, with Apocrypha) · Berean Standard Bible
From thirty years old and upward even unto fifty years old shalt thou number them, every one that entereth into the service (note: Heb. warfare), to do the work of the tabernacle of the congregation.
from thirty to fifty years old, counting everyone who comes to serve in the work of the Tent of Meeting.