A young boy was looking through the family album and asked his mother, "Who's this fellow on the beach with you with all the muscles and curly hair?"
"That's your father."
"Then who's the old bald-headed man who lives with us now?"
Let's be honest -- we all change as the years pass, and some of the changes are not for the better! Physically speaking, few 50- or 60-year-olds have improved physically from what they were like when they were 20 or 30 years old.
But the more important thing is how we are changing spiritually. In Ephesians 4, Paul talks about putting off the old man (sinful actions and attitudes) and putting on the new man (Christ-like qualities). That's not a once-in-a-lifetime activity. It's an ongoing process.
If we are going to grow, we must change. And what is the goal?
"...so that we can be mirrors that brightly reflect the glory of the Lord. And as the Spirit of the Lord works within us, we become more and more like him and reflect his glory even more." (2 Corinthians 3:18)