He Made Up a New Word- Maturenager

OK his birthday is quickly approaching, now this kid does research on video games and gaming systems (old gaming systems) so he has seen game that are rated M for Mature and T for Teen.  I explain to him AT LEAST 100 times a day WHY he cannot have those games, because they are rate M & T.  So after much thought on the subject he announces to me yesterday, "I want to be a maturenager" New Word Maturenager: Meaning Teenager that is Mature!! (does anyone know a MATURE TEENAGER????)  Meaning one who is 17!!!   LOL  that kid cracks me up!!