About 5–10% of all people will have an unprovoked seizure by the age of 80 and the chance of experiencing a second seizure is between 40% and 50%. Epilepsy affects about 1% of the population currently and affects about 4% of the population at some point in time. Most of those affected—nearly 80%—live in developing countries. ==Signs and symp... Found on http://en.wikipedia.org/wiki/Epileptic_seizure