You know today i have seen video of john Hendrickson a journalist who Stutter and is famous as he interview Biden and his article on magazine got viral and he also wrote a book on Stuttereing he strongly said Stuttereing is neurological and it cant be cure after certain young age and you have to find your way with Stuttereing and blocks while before i have seen Lee Lovetts who too write 3-4 books on Stuttereing he strongly claim Stuttereing can be cure .