Jason Reitman said that he needed to make three consecutive hit movies before he was allowed “to make a normally unmakeable movie.”

“Young Adult” is that movie.

At Thursday’s Ziegfeld preem, the helmer noted that the Paramount pic “is about a character – Charlize Theron’s Mavis — that doesn’t change. That’s against the rules, but the result is delightful.”

Not so surprisingly, the film’s cast and creatives saw themselves as fairly unchanging as well.

“When did I stop being a young adult? Very recently,” Elizabeth Reaser said. “Like two years ago maybe.”

“I’m still a young adult. What are you trying to say? I’m 31,” Collette Wolfe said.

“Oh my God, it’s still happening,” insisted Diablo Cody.

“I’m still working on it and I’m 65,” Jill Eikenberry said.

“I don’t know,” Theron said. “I don’t know because I don’t know what box that fits into.”

“You know what? It’s weird,” Patton Oswalt said. “There are days with my wife, with my daughter, my career, where I say, ‘I am 42 years old! I’m getting shit done.’ There’s other days where I’m fucking 12. Like ‘the way I just handled that situation I’m like a fucking 12-year-old.’ So I think it just fluctuates.”

Only Reitman was able to put that category in the distant past: “If you ask my parents, they’d say really early.”