KJV: 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,
NASB: from thirty years and upward even to fifty years old, everyone who entered the service for work in the tent of meeting.
KJV: This is it that belongeth unto the Levites: from twenty and five years old and upward they shall go in to wait upon the service of the tabernacle of the congregation:
NASB: "This is what applies to the Levites: from twenty-five years old and upward they shall enter to perform service in the work of the tent of meeting.
KJV: In the first place went the standard of the camp of the children of Judah according to their armies: and over his host was Nahshon the son of Amminadab.
NASB: The standard of the camp of the sons of Judah, according to their armies, set out first, with Nahshon the son of Amminadab, over its army,