Long term outcomes are generally good with little risk of neurological problems or epilepsy. Those who have one febrile seizure have an approximately 30- 40% chance of having another one in the next two years, with the risk being greater in those who are younger. Simple febrile seizures do not tend to recur frequently (children tend to outgrow them) and do not make the development of adult epilepsy significantly more likely (about 3–5%) compared with the general public (1%). Children with febrile convulsions are more likely to have a febrile seizure in the future if they were young at their first seizure (less than 18 months old), have a family history of a febrile convulsions in first-degree relatives (a parent or sibling), have a short time between the onset of fever and the seizure, had a low degree of fever before their seizure, or have a seizure history of abnormal neurological signs or developmental delay. Similarly, the prognosis after a complex febrile seizure is excellent, although an increased risk of death has been shown for complex febrile seizures, partly related to underlying conditions. Febrile seizures happen between the ages of 6 months and 5 years. The peak age for a febrile seizure is 18 months, with the most common age range being 12–30 months of age. They affect between 2-5% of children. They are more common in boys than girls. Febrile seizures can occur in any ethnic group, although there have been higher rates in Guamanians (14%), Japanese (6-9%) and Indians (5-10%).