Autism is a complex neurodevelopmental disorder. Many causes have been proposed, but its theory of causation is still questionable and ultimately unknown. The possibility of autism is associated with several prenatal factors, including advanced paternal age and diabetes in the mother during pregnancy. ASD is associated with several intellectual or emotional gifts. Some individuals perceive it to be connected to genetic disorders and with epilepsy. Autism is believed to be largely inherited, although the genetics of autism are complex, and it is unclear which genes are responsible. Little evidence exists to support associations with specific environmental exposures.