Actually, for me, it's the other way around. When I'm in class (I'm in high school, currently) I'm the one thinking "GROW UP, PEOPLE!! !"
When NT's are teenagers (mostly the boys), they are at their most immature state (and ugly state, in the case of my high school boy peers XD). However, they at least have fun and aren't depressed all the time.
But, as you all know, when an Aspergian or Autistican is a teenager, it's really different. For me, specifically, it means still not being able to choose what I want to truly wear, not able to make friends as smoothly as my peers, and feeling the biggest rip from my parents called "growing into an adult" (I feel it more than the NT teen, who doesn't care about it).
But I have an advantage. I can so handle my emotions, and I'm so mature that NT teen boys make babies look mature (as my sort-of-favourite teacher once pointed out; he specifically told them "You guys are so immature that you make babies look mature". Thank you, Mr. Costello! You really are the most awesome teacher in my school, even if you're slightly loud and intimidating!).
Well, if someone tells me to grow up now (and if they're a teen), I'll just say: "No, you grow up. Kick all your addictions, stop calling people f*gs, n**bs, and douche bags and listen to the teachers when they're trying to teach a lesson."