Late Autism Diagnosis: Why It Happens and What to Do

Masking throughout childhood often delays recognition of autism signs

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Late Autism Diagnosis: Why It Happens and What to Do An increasing number of adults are being diagnosed with autism for the first time Masking throughout childhood often delays recognition of autism signs An autism diagnosis can support a DTC application if you meet the Canada Revenue Agency’s functional criteria. Developmental services (DSO/Passport) have their own eligibility test; an autism diagnosis alone may not qualify. Read the guide www.endthewaitontario.com/late-autism-diagnosis

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Masking throughout childhood often delays recognition of autism signs A short explainer with music and captions. 54 seconds.

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Evidence supports autism screening and intervention commencing in the first 2 years of life — earlier identification directly enables earlier intervention during the highest neural plasticity window

Primary source Zwaigenbaum L, Bauman ML, Stone WL, et al. (2015) Verified 2015-10-01

1 in 50

According to the 2019 Canadian Health Survey on Children and Youth, about 1 in 50 children and youth aged 1 to 17 in Canada had an autism diagnosis

Primary source Public Health Agency of Canada (2024) Verified 2024-03-26

WHO recommends accessible, community-based early interventions for children with autism. Timely evidence-based psychosocial interventions improve communication and social engagement

Primary source World Health Organization (2025) Verified 2025-09-17
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Last system verification: 2026-11-03. Next scheduled update: 2027-02-01.

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Written by Spencer Carroll

Founder & Autism Advocate

Lived experience: Parent of autistic child in the OAP system