'Mature' in the Bible

The soil produces crops by itself; first the blade, then the head, then the mature grain in the head.

Yet we do speak wisdom among those who are mature; a wisdom, however, not of this age nor of the rulers of this age, who are passing away;

Brethren, do not be children in your thinking; yet in evil be infants, but in your thinking be mature.

until we all attain to the unity of the faith, and of the knowledge of the Son of God, to a mature man, to the measure of the stature which belongs to the fullness of Christ.

But solid food is for the mature, who because of practice have their senses trained to discern good and evil.