Getting old just happens.
But growing up is a choice.

When I was a child, I talked like a child, I thought like a child, I reasoned like a child. When I became a man, I put the ways of childhood behind me.
— 1 Corinthians 13:11

The main task you have in this life is the kind of person you become

And as Jesus grew up, He increased in wisdom and in favor with God and people.
— Luke 2:52

During the days of Jesus’ life on earth… He learned obedience from what He suffered and, once made perfect, He became the source of eternal salvation for all who obey Him…
— Hebrews 5:7-9

Until we all reach unity in the faith and in the knowledge of the Son of God and become mature, attaining to the whole measure of the fullness of Christ.
— Ephesians 4:13

Then we will no longer be infants, tossed back and forth by the waves, and blown here and there by every wind of teaching and by the cunning and craftiness of people in their deceitful scheming.
— Ephesians 4:14

We proclaim Him, admonishing and teaching everyone with all wisdom, so that we may present everyone fully mature in Christ.
— Colossians 1:28

In fact, though by this time you ought to be teachers, you need someone to teach you the elementary truths of God’s word all over again. You need milk, not solid food! Anyone who lives on milk, being still an infant, is not acquainted with the teaching about righteousness. But solid food is for the mature, who by constant use have trained themselves to distinguish good from evil. Therefore let us move beyond the elementary teachings about Christ and be taken forward to maturity…
— Hebrews 5:12-14, 6:1

The main task Jesus has in your life is
the kind of person you become