In the United States, the age of onset is before the age of 18. There must be evidence of disability during that developmental period.

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Quizplus · Accepted Answer

In the United States, for many developmental and mental health disorders, diagnostic criteria often include the onset of symptoms before the age of 18, and there must be evidence of the disorder during the developmental period to establish a diagnosis. This is particularly true for developmental disorders where early onset is a key diagnostic criterion.

In the United States, the Age of Onset Is Before