Flutterby™! : I'm only 22 and he's an adult?

So Anthony Weiner's weiner is in the news again, which is largely a "who cares" except that @arcticwolfe pointed out this choice quote from the woman releasing the pictures and chats:

The woman, using the handle “Anonymous” said of Weiner, “The part that’s most annoying is that I was 22 years old and in a bad place, but if anyone asked him he would say the same thing about himself, yet he’s an adult.”

So the context is hard to suss out here, and frankly I'm not interested in diving into the whole sordid thing too deeply, but when did "22 years old" become "not adult"?