I feel this immensely!!! My stuttering peaked in high school and while it would come and go, it came back in full force over the past few years. I’m a 32F. For me, I think remote work and stress play a big role. I stumble mostly on words that start with a vowel sound. It’s gotten bad lately and is affecting my work bc I’m less likely to speak up during meetings out of fear of embarrassment. It is such a frustrating thing. I wish I knew what caused it. I think it’s partially hereditary at least for me.