Can you develop autism later in life?

Early-Onset Symptoms May Be Recognized Later in Life. ... In the case of high-functioning autism, for example, it's not unusual for a child (or even an adult) to receive a diagnosis much later than most children are diagnosed with autism—but that's not because symptoms suddenly developed. read more

Neither Older Children Nor Adults Can Develop Autism To begin with, by definition, older children, teens, and adults do not develop autism. In fact, in order to qualify for an actual autism spectrum diagnosis, you must have symptoms that appear during early childhood (that is, before age three). read more

Hope you can get some answers soon.I do recall reading that for a diagnosis of classic autism that symptoms must be present before age 3. A PDD-NOS diagnosis is sometimes applied for later age of onset as well as subthreshold symptomolgoy. read more

Firstly, I have to say that there is no official diagnosis called "regressive autism" or "late-onset autism”. Neither children nor adults develop autism later in life. Sometimes the diagnosis comes late but not the symptoms. read more