Dr. Chugani: Tourette's is not a single gene disorder. Many genetic mutations come together to give various degrees of Tourette's. That's why even siblings affected will have different degrees of involvement. OCD, ADHD, and a behavioral disorder are the most common co-occurring conditions. read more
In some cases Tourettes can be outgrown. Many times the condition will peak during the teen years and subside into adulthood, but as other respondents have mentioned, this is not always the case. In all of my friends with Tourettes and in myself, the condition has persisted past adolescence. read more