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Diagnosing ADHD in Adults For many people, the symptoms of ADHD continue throughout their life. As adults, these signs can have a significant impact on family and work. To receive a diagnosis of ADHD your symptoms must have begun in the early years of your life (technically before the age of 12). Your evaluator will go over your personal and medical history. They can also talk with your spouse or your friends, colleagues and partners. This lets them see your challenges from a diff