It's seventeen I think.
I still don't get how he can mistake him for being seventeen; have you seen the size of that mustache? What kind of seventeen year old has that... I perceived it as him being sarcastic. As for my favorite character quote it's gotta be one of Fantastic's lines. The guys idiotically hilarious.
I have a cousin who's 28 but lost all of his hair and grew a goatee, he looks to be in his late 40s. Maybe he just didn't assume he would look his age.
And you're right, its seventeen.
"Is it safe for me to enter Nellis?"
"Sure, just run as fast as you can and flail your arms about."
That was a good laugh.