You know you can do your bar mitzvah at any age right? Usually it's done at 13, but it doesn't actually have to be.
I never did it, personally, and don't really care much. While my dad is Jewish, my mum isn't. So according to a lot of folks I'm not Jewish and I've never felt entirely at ease with the whole thing. One foot in each world or something. When the rabbi of the Reform Temple I grew up going to offered to help me through conversion that kind of drove it home...