Generalized anxiety tends to initially arise during the mid-teens through the mid-20s.
Anxiety disorders are the most common mental illness in the U.S., affecting 40 million adults in the United States age 18 and older. Generalized anxiety disorder tends to occur with other anxiety disorders and with depression. Because the comorbidity is so high, researchers believe that many of the factors involved in predicting anxiety disorders, in general, are particularly important for understanding Generalized anxiety disorder.