Well, since you didn't say where you live, that may be difficult to do. Without that, I can say in general check with any dance studios in your area. They might offer ballroom dance classes you could take. Another option would be to check with any colleges/universities in your area, if there are one or more, and see if they have a ballroom dancing club. Here, the classes we offer are open to the public so anyone can join. Granted most of the people will be college age, about 17-23, somewhat older if you've got grad students involved, too, but this could be better than a studio where they might have a generally older crowd than that. Classes specifically for people around your age, I have no idea. You'd have to ask around and see.