Camilla Foster3 April 2026

The seven key signs of autism in adults aged 40 and over

This points to an alarming overall under-diagnosis rate of 89.29 per cent within this age bracket, a figure that reportedly escalates further in older demographics. The findings were published in the Annual Review of Developmental Psychology.

A significant majority of autistic individuals over 40 in the UK are living without an official diagnosis, new research reveals.

Researchers at King’s College London’s Institute of Psychiatry, Psychology & Neuroscience (IoPPN) reanalysed 2018 UK healthcare data, estimating a staggering 91.45 per cent of autistic men and 79.48 per cent of autistic women aged 40 to 59 remain undiagnosed.

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The seven key signs of autism in adults aged 40 and over | elderPA