Piggy backing on you; I'm currently an undergrad studying speech therapy, and I just want to say that cluttering actually is considered stuttering, it's just a part of the same motor - planning package. It's very difficult to fix as you get older, but if you find the right SLP and are dedicated you will succeed. It's a bit like learning to skate or speak a new language, it's more difficult as you get older but by no means is it impossible. So best of luck to you!.