I stutter since i was 7 years old (am 22 now) and you can consider me as an adult i guess. I stuttered like every sentence, had various problems because of it, and now i can speak fluently with everyone due to the speech therapy and everyone excepting my stutter. Only problem i have is stuttering while being stressed like class presentation in colleage or oral exam, reading in front of big number of people. In regular life i can speak normaly and many people can't believe i stutter until i tell them i do. I think the key is to not care what anyone will say and also trying to get better at speech every day.