My dad stutters and it was passed down to me. I’m 32. He has a daughter that’s 31 and she doesn’t stutter. I don’t stutter at when I’m alone. I’ve stuttered my entire like. Maybe it’s genetics. Maybe it’s not. My dad and I are the only two that stutter in the entire family. I have a son and daughter that don’t stutter. They are 8 and 9. I thought it would pass down to my son but it didn’t so who knows.