I feel maturity is a thing of the mind, it literally doesn't come with age .

Maturity is being able to respond to things happening around you at the right time , knowing when to act and when not to, knowing when to talk and when not to, seeing others first before you.

Am not trying to be disrespectful, but there are situation we expect older once to act with so much maturity but they end up messing things up and also forgetting that the smaller once have their own emotions too.

Of a truth i agree with you that maturity and common sense doesn't come with grey hair but i feel it is built over time as we encounter things.