Well I began to sutter when I was around 7-8 years old. I was fortunate enough to have parents who didn't "fuck around" and sent me directly to specialists and such. By the age of 13-14 I had most of it "under control". I only learned English around the age of 15-16 so maybe I subconsciously applied all the tricks I was given to this new language and since I was learning it from scratch, creating new patterns in my brain or whatever happens when you learn something, my stuttering never came up? I honestly have no clue.