I went to speech therapy when I was young, around 11 years old and it really helped me. In 2-3 months I was speaking normally. But the stutter came back and we weren't in a good financial position to resume it so it got worse. Now i'm 24 and I've tried 3 different therapist in the last 1.5 years but they didn't help much. But I guess it depends. You can try and see if it works for you.