Should we be forced to retire at fifty? From thirty years old up till fifty years old, all who come to the army to do the task in the Tent of Meeting. This is the work of the Kohathites. Only in the desert, writes Maimonides (Kli HaMikdash III), were the Levites forced to retire. And this was because building and dismantling the Tabernacle was too strenuous. In the Temple, the Levites were never disqualified because of their age. If they wished, as long as God blessed them with life, they continued working for the Temple as doormen and guards.