I read in a book about a guy who legally changed his name to something he could say fluently. Then when time went on, he began having difficulty saying the new name. It got the point where he could no longer say the new name, so he legally changed his name again. And of course, eventually he grew unable to say that one, too. Doesn't mean it's getting worse with age, just that it's an ever-evolving symptom. When I was a teen, I could talk on the phone just fine. My 20's, however? No fucking way. Not even remotely. Now in my 30's I'm finding myself able to speak over the phone again, almost like my 20's never happened. I also agree with /u/jetaj about stress. When my mom passed away, I've never stuttered so bad. I could barely speak at all. But I slowly ebbed back to my usual fluency over time. It's very common for a stutterer's fluency to drop with high stress.