Jesus himself, when he began to teach, was about thirty years old, being the son (as was supposed) of Joseph, the son of Heli,
And he came into all the country about Jordan, preaching the baptism of repentance for the remission of sin; as it is written in the book of the words of Isaiah the prophet, saying, The voice of one crying in the wilderness, Prepare ye the way of the Lord, make his paths straight ( Luke 3:3-4 ).