Parallel
Numbers 4:23
King James Version (1769 Blayney revision, with Apocrypha) · Berean Standard Bible
From thirty years old and upward until fifty years old shalt thou number them; all that enter in to perform the service (note: Heb. to war the warfare), to do the work in the tabernacle of the congregation.
from thirty to fifty years old, counting everyone who comes to serve in the work at the Tent of Meeting.