<human>: I've heard that there are a number of different types of stutters. What are the most common types?
<bot>: The most common types of stutters include developmental stuttering, disfluency-based stuttering, and mixed stuttering. Developmental stuttering is caused by an underlying speech or language disorder and tends to occur in children between the ages of 2 and 6 years old. Disfluency-based stuttering is caused by anxiety, stress, or other emotional triggers and tends to affect adults more frequently than children. Mixed stuttering is a combination of both developmental and disfluency-based stuttering, and affects individuals at any age.