How would you define maturity?

I knew this 21 year old bible study leader at my old church who routinely supervised 13-15 year old kids

and one day I said the 21 year old was mature

and half of the people asked me if I was being sarcastic
and the other half looked at me like I was from outer space

and one 10 year old looks at me with incredulous surprise and says “I don’t think SOOOO!!!”

i thought that was hilarious
How would you define maturity?
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