I agree with you. Statistically speaking research states that most people who stutter start stuttering around 2 years of age. Late onset is indeed uncommon and can even occur into adulthood (think psychogenic stuttering). Research states that most late onset PWS recover from stuttering within a couple of months and some cases years. **Conclusion**: From what I understand from research books is, whether we started stuttering at age 2, or later all the way into adulthood, we never start out with '*stuttering anticipation*' or other *elements of advanced stuttering.* According to a PhD researcher stuttering usually develops gradually but **only** (according to him) if we perceive stuttering as a problem and to be avoided. For example, if PWS have a lot of negative experiences then we could develop this unhelpful attitude/belief in my opinion. I can recommend chapter 3 (55 pages in total) of Stuttering foundations and clinical applications (2023), this chapter explains in detail the onset of PWS.