Autism is a development disability that affects the way people communicate, interact with peers and people and their behavior. Kids who have autism may start showing signs around the age of 18 months, but these signs are usually seen between the age of 2 and 3. Autism is a life-long condition and it is a spectrum disorder. Spectrum disorder means that people can experience a wide range of symptoms and the level of severity. 1% of the world population is affected by these disorders.