Yes.  I am a 65 year old male.  Stuttering since 1967.  Similar experiences.  What helps my fluency: Green tea Magnesium rich foods w vinegar for enhanced magnesium absorption.  Hummus w vinegar works well.  Flaxseed helps too. Hydration.  Pass large amounts of urine.  More flow better fluency  Mediterranean diet.  Lots of beans and veggies.  No junk food.  No pork, no beef.  Keep it alkaline. Thanks for your post.