Andy Milonakis is 31 years old...wtf?

[dw2006]

I was just watching the movie Waiting (no idea why I didn't change the channel) and notice Andy Milonakis in the movie and decided to imdb him to see what else he has been in. Upon reaching his imdb listing I noticed he is 31 years old and has some hormone disorder. I have seen his show on mtv a few times and thought he was some crazy 12 or 13 year old. This was shocking to me. So I was basically wondering if this is common knowledge and also what other celebrities have surprising ages. Another one I can think of is James Lipton of Inside the Actor's Studio who is over 80 years old but looks much younger.