Parallel
Numbers 8:25
Swete's Septuagint · Berean Standard Bible
καὶ πεντηκονταετοῦς ἀποστήσεται τῆς λειτουργίας καὶ οὐκ ἐργάζεται ἔτι,
But at the age of fifty, they must retire from performing the work and no longer serve.