I’m 44 and I still do it, but I’ve probably been able to enjoy 98% fluency the last few years. For the last decade, I’ve practiced what is referred to as fat to skinny breathing. Take a deep breath before you speak, let out a little air, and then begin talking. As others have said when I get stressed or anxious, I’ll do it, but I can work through it now. I’ll incorporate a little humor by slapping myself on the back of the head like a CD player that would skip. It always works and gets a chuckle out of people. I don’t know why slapping myself on the back of the head works! 🤷‍♂️ You absolutely have to be stubborn and tenacious though. I think that’s where a lot of people in the sub tell people to not give up.