Genesis 37:2

2These are the generations of Jacob.

Joseph, being seventeen years old, was pasturing the flock with his brothers. He was a boy with the sons of Bilhah and Zilpah, his father’s wives. And Joseph brought aa bad report of them to their father.

Numbers 4:3

3 bfrom thirty years old up to fifty years old, all who can come on duty, to do the work in the tent of meeting.

2 Samuel 5:4

4David was thirty years old when he began to reign, and che reigned forty years.

Luke 3:23

The Genealogy of Jesus Christ

23Jesus, dwhen he began his ministry, was about ethirty years of age, being fthe son (as was supposed) of Joseph, the son of Heli,
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