The level at which one understands society's, and opposite sex's appeal to oneself. Is able to recognize appropriate times to act immature and can confidently carry themselves through times of despair, relationship issues, job interviews, exams, family problems, etc.
A mature person is mentally free of all immature excuses such as, egocentric blameworthiness, "too tired", "I forgot", or lying for cover. Instead, a mature person will respond to issues with admittance and apologize.
Local 1: Hey why did the chicken cross the road?
Local 2: I have no idea, it would be spectacular if you could tell me.
Local 1: To get to the other side
Local 2: I do not find that even slightly humorous.
Local 1: But you found that funny last week
Local 2: Yes well I have had a maturity spurt which allows me to realize the childish nature of that joke.