Most children who have epilepsy -- which by definition means that they've had more than one seizure -- will outgrow the condition. Most children with epilepsy are perfectly healthy and normal in other ways. 70% to 80% of children with epilepsy can control the condition completely with medication.Epilepsy is the most common childhood brain disorder in the United States. Nearly 3 million people have been diagnosed with this disease, while 450,000 of them are under the age of 17. Fortunately, two thirds of the child population will overcome the side effects, most notably, seizures, in teenage-hood through treatment. Epilepsy affects all ages groups. But for children, a variety of issues exist that can affect one's childhood.