Hahaha. That's so dumb. Why does that matter? A 15 year old has a sense of humor and gets jokes. I don't think I would find this more or less funny at 15. It is possible that jokes get less funny as you get older/mature. I'm hoping you don't find fart jokes or butt jokes as funny as when you were a kid... I actually think fart jokes are funnier now than I did when I was 15. My 4 year old and a friend of hers were telling jokes back and forth to each other in the form of "Do you know what I use for a toothbrush? Leaves!" So I asked if I could join in, and they said yes. I asked "You know what I use as a pillow? A jar full of farts." It absolutely killed, and I have to admit that being being spur of the moment, it was hillarious. I mean...a jar ain't even comfortable! The farts don't change that fact! But on the Meph front, I don't think this dood is Meph. I think there are a lot of Meph-types on these interwebs. I mean, there but for the grace of God...who doesn't exist, btw.