Humility isn’t always a maturing of age but soul. Just as maturing in age doesn’t automatically make you humble neither does humility automatically come with age. “Not giving a care what others think” is freeing, I’m sure, but not necessarily humility.
Humility is knowing your full worth and value in Christ and knowing you can’t do one ounce of it without Him. There can be pure humility in one who acknowledges their God given gifts and their need for Christ in it. In fact, may I suggest, it’s time for the believer to rise up and stand firm then in what God has gifted us! (Ephesians 6)