'Full grown' in the Bible

We speak wisdom, however, among those who are full grown; yet a wisdom not of this world, nor of the rulers of this world, who are coming to nothing.

until we all attain to the unity of the faith, and of the knowledge of the Son of God, to a full grown man, to the measure of the stature of the fullness of Christ;

But solid food is for those who are full grown, who by reason of use have their senses exercised to discern good and evil.

Then the lust, when it has conceived, bears sin; and the sin, when it is full grown, brings forth death.