However, once they reach the age of fifty they need to retire from the work and won't serve any longer.
Count men aged thirty to fifty—all who are entitled to do the work of serving in the Tent of Meeting.
“This rule applies to the Levites. Those twenty-five or older shall serve at the Tent of Meeting.
They can still help their fellow Levites in their assignments, but they are not to do the actual work themselves. These are the arrangements in the case of the Levites.”
I have fought the good fight, I have finished the race, I have kept my trust in God.