Diagnosis of autism has increased in recent decades, causing some debate over whether it is new or caused by environmental factors. A comprehensive review of research on autistic adults over 40 years old has found something else. Autism among older generations is undiagnosed in as many as 90% of cases.
King’s College London researchers conducted a new study focusing on the condition in midlife and older age. They found that the vast majority of over-4os remain undiagnosed, leading to significant consequences for their health, wellbeing, and quality of life. Studies have also found that autistic people have a greater risk of early dementia and suicidal ideation, and a lower life expectancy compared with their peers.
In the study, the team analysed British health records, finding that approximately 89% of autistic people aged 40-49, and a staggering 97% of those over 60, did not have a formal diagnosis.
“These very high underdiagnosis estimates suggest that many autistic adults will have never been recognized as being autistic, and will have not been offered the right support,” said lead author Dr Gavin Stewart, a researcher from King’s College. “This could make them more susceptible to age-related problems, for example being socially isolated and having poorer health.”
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