Original symptoms included hyperactivity, learning problems, inattention and conduct problems. The name is not as important as the key concept of inattention . Many names are associated with this problem of inattention. No, a longstanding dysfunctional pattern is necessary. Symptoms or features must be distinguished from a life long pattern before 7 years old.
Exuberance is different from symptoms way beyond average and causing dysfunction in life.
Using standard rating scales such as Conners or others is necessary for assessment. Yes, boys are often inattentive and hyperactive. Girls do have the disorder but are usually not hyperactive or a conduct problem. Girls are mistakenly called lazy, slow or spacey. Women and girls are often misdiagnosed as anxious or depressed.