The Forgiver - 40:67
He created you from dust, then from a drop, then from a suspended embryo. Then He brings you out as children so that you may mature and grow old. Some of you are taken from life earlier. You will reach a predetermined age so that you may comprehend.
The age of maturity for man:
The Sandhills/46:15
"We admonished man to do good to his parents, and his mother carries him laboriously and gives birth to him laboriously. It takes thirty months from the time he is carried in his mother´s womb to his weaning. Finally, when he reaches the age of maturity and is forty years old, he says: "My Lord, direct me to be grateful for the favor You have bestowed on me and my parents and to do good deeds with which You are pleased. Correct my progeny. I am of those who repent and submit to You."