Final answer:
The average age of onset for an anxiety disorder in the U.S. is between 15-20 years old, which encompasses conditions like OCD, PTSD, and various phobias, with foundational issues often beginning earlier in childhood.
Step-by-step explanation:
In the U.S., the average age of onset for an anxiety disorder is b) 15-20 years old. Anxiety disorders are the most common mental disorders in the United States and can significantly affect individuals’ lives. The term 'anxiety disorders' encompasses various conditions such as obsessive compulsive disorder (OCD), panic disorders, posttraumatic stress disorder (PTSD), social phobias, and specific phobias.
It is crucial to note that while anxiety is a normal response to stress at times, anxiety disorders are more persistent and can last for several months. Some studies, such as those by Moffitt et al. (2007), shed light on the childhood risk factors linked to these disorders, suggesting that the foundational issues often begin much earlier than the actual onset of the disorder.