Direct answer
Happé, F. & Charlton, R.A. · Croen, L.A. et al. · Verified 2026-08-10
Quick summary
In brief
Key points
The Diagnostic Gap in Older Adults
Many older autistic adults may be undiagnosed. Some spent decades with misdiagnoses or no diagnosis at all. Late diagnosis can explain lifelong differences and guide support.
Adult autism diagnosis in Ontario is available through a limited number of specialists. Ask each clinic about referral rules, fees, and current waits. Assessment should account for decades of masking.
Health and Aging Considerations
Autistic adults face elevated rates of several chronic health conditions: cardiovascular disease, diabetes, autoimmune conditions, gastrointestinal disorders, and neurological conditions. A large population study by Croen et al. (2015) found that autistic adults had significantly higher rates of nearly all medical conditions studied compared to non-autistic peers, even after controlling for co-occurring intellectual disability.
Healthcare access barriers include sensory challenges in medical settings (bright lights, loud waiting rooms, physical examination discomfort), communication difficulties that affect symptom reporting, and physicians' lack of training in autism in adults. Many autistic older adults have learned to avoid medical care, leading to delayed diagnosis of treatable conditions.
Ontario's aging services system — including Community Care Access Centres (now Home and Community Care Support Services), long-term care homes, and seniors' community programs — has minimal training in supporting autistic individuals. As the autistic population ages, these services will need significant adaptation.
Housing and Long-Term Planning
Housing is a critical concern for aging autistic adults. Families need a plan before parents can no longer provide care. Ask early about eligibility, waitlists, and backup supports.
Ontario housing options may include developmental-services housing, affordable housing, mental health supportive housing, co-housing, and private supported living. Confirm eligibility and current waits for each option.
Evidence and sources
Happé, F. & Charlton, R.A.
Aging in Autism Spectrum Disorders: A Mini-Review. Gerontology, 2012; 58(1):70-78
Croen, L.A. et al.
The Health Status of Adults on the Autism Spectrum. Autism Research, 2015; 19(7):814-823
Frequently asked questions
- Can older adults be diagnosed with autism?
- Yes. Autism diagnosis is available at any age. For older adults, assessment should account for masking, co-occurring conditions, and limited childhood records. Ask clinics about current waits.
- What happens when aging parents can no longer care for their autistic adult child?
- Plan well in advance. Ask Developmental Services Ontario about residential support if eligible, speak with a lawyer about a Henson Trust, document routines, and identify people who can help oversee care.
- Do Ontario long-term care homes accommodate autistic residents?
- Most Ontario long-term care homes have minimal training in supporting autistic residents. Sensory environments, social expectations, and rigid institutional routines can be extremely challenging for autistic individuals. If long-term care placement is necessary, seek homes with specialized behavioural support units and request autism-specific training for staff. The Community Networks of Specialized Care can provide consultation.
Where the waitlist stands
Families navigating autism services in Ontario face a documented multi-year wait. Here is the Ontario data — and a two-minute way to push back, when you are ready.
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