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Diagnosing ADHD in Adults For many people, the symptoms of ADHD persist throughout their lives. These symptoms can have a major impact on family and work as they grow older. To be diagnosed with ADHD your symptoms must have begun in the beginning of your childhood (technically, before the age of 12). Your evaluator evaluates your medical and personal history. You might also want to talk to your friends, family members or coworkers. This helps them to see your challenges from other perspectives. Diagnosis Adults who suffer from ADHD must also m