Maturity means being able to say yeast infection without giggling and being honest with your doctor about your number of sexual partners. Maturity doesn't necessarily come with age, but rather when life wears you down to the point where you don't want to laugh anymore and you don't have the energy to be embarrassed about your low self-esteem years.
Stave off maturity for as long as possible by living with your parents and never missing college night at Mr. Wang's.