39 All the men from thirty to fifty years of age who came to serve in the work at the tent of meeting,

Read Numbers 4:39 Using Other Translations

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,
from thirty years old up to fifty years old, everyone who could come on duty for service in the tent of meeting--
The list included all the men between thirty and fifty years of age who were eligible for service in the Tabernacle,