I'm 33 in the military. I only state military because we are known to mess with people. No one really messes with me, honestly. Sometimes people may make a joke here and there but it's all about how you react. If it's someone I don't know, I just keep my current expression which is most of the time serious. If it's someone I know or a friend I'll just say "I have a speech impediment. I can't help it, but you can help not being a dick" lol.