It sickens me that a 13 year old is so much better at that trick than I am. ;-)
In all seriousness though, take it from someone that has looked young their entire life (I'm now 26 and can still scam it at 20 and be believed) it is definitely -not- a bad thing, so don't be so defensive about it. Not only can you always win the guess your age competition at carnivals and theme parks (lmfao), in my experience, chicks dig it, and people innately trust you if you look younger, which is no bad thing for a magician. (Or a con man....-coughs-) If you are going to perform you have to get used to the public making comments like that, and its seldom going to be in a bad way. You're going to get..."wow you look young" a lot, not meant unkindly but as a statement of fact so I would seriously recommend getting over the complex otherwise the more you perform in public the worse it'll get and you'll either run off stage crying or start punching people randomly at the end of performances.
As to the performance, really, I like how you used the camera, it simulated misdirection which was fine. The handling was good. I know the trick and even then the slights that were visible were really good and I didn't spot any flashes.
Your performance was too D&D however. Don't get me wrong, they do great card tricks and have come up with some interesting stunty magic, but their performance is definitely not their strongest point in their instructional DVDs. (With the main purpose presumably being instruction rather than performance.)
All in all this was a great piece of work and I enjoyed watching someone perform this trick well as I've seen this butchered on camera so many times its untrue, lol.
Good job.