Finally I am relevant to a conversation! I am an SLP (Speech therapy) grad student that studied under the top Fluency professors in my region of the USA. One of them is on ASHA's executive board for cluttering and the other is on the board for stuttering. I think I can answer a few of your questions. First, it is VERY common to see someone come back to therapy after leaving when they were a teenager or a young tween. Usually around middle school a lot of patients will just get tired of therapy and choose to opt out. They later come back when they are ready to try again. Usually that is the time that we see the best results. Why? Because motivation is very very high and that makes the biggest difference in terms of success. Every client that I have seen come through my clinic for their "second round" of therapy has left feeling successful. You are right that most of our language is learned when we are younger, and fluency disorders are much easier to treat before secondaries or emotional side effects take place. Cluttering and stuttering are complex disorders, so any therapist worth their salt will treat the entire thing...not just the fluency. A real, true comprehensive treatment plan also delves into treating any secondaries and the emotional aspects. Cluttering is not 100% fully understood in the therapy world. It requires specific criterion to meet a diagnosis and a very skilled clinician to treat it. I would recommend that you find a certified therapist in fluency. I like to use http://www.stutteringspecialists.org when trying to locate a therapist. There is a distinct difference between a SLP with and an SLP without their board certified fluency certificate. It takes LOT of extra time and skill to achieve that level of a certificate, so they really know what they are doing. Plus a lot of them work at universities, so you can probably go to a university clinic (which is usually pretty cheap) to get a great service. You will probably see a lot of negative stories that people post in this sub about how therapy didn't help them, and I really don't blame them. Fluency is one of the hardest disorders to treat as an SLP and really deserves to be treated by a specialist. TL;DR Remember though that there is no CURE for stuttering or cluttering. But therapy can really help lesson the strain it has and make you feel a lot better.