Numbers 4:39

New American Bible - revised edition

all between thirty and fifty years of age who will join the personnel to work in the tent of meeting—

See the chapter Copy

all between thirty and fifty years of age who will join the personnel to work in the tent of meeting;

As for the enrollment of the Gershonites, by clans and ancestral houses,

their enrollment by clans and ancestral houses was two thousand six hundred and thirty.

When Jesus began his ministry he was about thirty years of age. He was the son, as was thought, of Joseph, the son of Heli,