Abstract of main article: The official definition of ADHD says that the symptoms must start before 7 years of age, but some ADHD only starts with puberty or when the child grows older and more demands are put on them. Especially the inattentive mode of ADHD in girls is sometimes not recognized until in their teens.

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Sources list for:
"ADHD in Children, Child or Teens ADHD, Age of Onset"

Clinical experience of the experts in the KOM2002 team
  1. AMERICAN PSYCHIATRIC ASSOCIATION, WASHINGTON, DC (1994). DIAGNOSTIC AND STATISTICAL MANUAL OF MENTAL DISORDERS: DSM-IV, 4TH ED.p.78-85 Attention-Deficit/Hyperactivity Disorder
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