I was in speech therapy since I was 3 because I wasn't speaking just making random noises, throughout preschool and elementary school I never really stuttered just had trouble pronouncing words. Then in fourth grade, I was taken out of speech therapy because I wasn't getting better and then I got a super bad stutter, I could barely get a sentence out. Luckily now it's much more manageable and I have discovered that it's when I think of what I want to say I stutter. So I'll say around late 4th grade.