No I doubt there are very many 13 year olds doing weight watchers. It's not a bad thing though. You are making a commitment to better yourself and become healthier so you can live a better and longer life. I wish you good luck with your weight lose and I hope things go well for you. I have heard great things about weight watchers.
I used to work for weight watchers and yes I did have a couple of 13 year olds that would come with their mom. It was hard for them being in school most would bring their lunch. Hope you find a friend to do this with it helps a lot! Maybe try the web site. Good luck to you girl!