43/m. I was able to gain much more control over my fluency in my 30s. How? I'm not 100% sure. As a teenager I did some intensive speech therapy. It helped but I still really struggled.. I can say that acceptance of you stuttering helps. Learning to diaphragm breathe 100%. Pay very close attention to how your body reacts when you talk - all the muscles, tension... And try to use this knowledge to leverage fluency skills... It's a mixed bag. I still have horrendous days and weeks.