Treasury of Scripture Knowledge
from thirty years old and upward even until fifty years old, all that enter upon the service, to do the work in the tent of meeting.
This is that which belongeth unto the Levites: from twenty and five years old and upward they shall go in to wait upon the service in the work of the tent of meeting:
1 Chronicles 23:3
And the Levites were numbered from thirty years old and upward: and their number by their polls, man by man, was thirty and eight thousand.
1 Chronicles 28:13
also for the courses of the priests and the Levites, and for all the work of the service of the house of Jehovah, and for all the vessels of service in the house of Jehovah;
And Jesus himself, when he began to teach , was about thirty years of age, being the son (as was supposed) of Joseph, the'son of Heli,
1 Timothy 3:6
not a novice, lest being puffed up he fall into the condemnation of the devil.