The turning point in the spiritual development of a person is when they think about how much they can give instead of how much they can get, and how much they can help others instead of how much that can be helped.
Maturity has nothing to do with a persons physical age.
True maturity comes when anyone attains SELF-REALIZATION.
When I was a child (in the egoic state of mind), I spoke as a child, but now that I am a man (in a state of Divine-Self-Realization) I put away childish things.
-St. Paul, I Corinthians 13:11