Children who stutter often exhibit physical behaviors when they stutter. The key to addressing them is understanding the reasons those "secondary characteristics" develop, rather than focusing on the observable behaviors themselves.
Many teens who stutter can benefit from treatment, but it's important that this treatment comes at the right time. Understanding the relationships between "pain of change" and the "pain of staying the same" can help speech-language pathologists know when and how to help teens who stutter.
People who stutter can certainly gain inspiration from hearing about famous people who stutter...They might find even more benefit in meeting and actually getting to know not-so-famous people who are living their lives to the fullest regardless of whether or not they stutter!