There are many factors to consider when discussing the typical age of autism diagnosis because children on the autism spectrum range in age, socio-economic group, race, gender, etc. Due to these factors and others in the general population, children with autism spectrum disorder (ASD) can be reliably diagnosed as early as two to ten years old.
What is the common age of diagnosis for children with autism worldwide?
Many studies suggest the average age of children diagnosed with autism is around three years old in both the United States (US) and in the United Kingdom (UK).