Clinical research says intervene before age 6, when neuroplasticity is highest. Families registered in 2021 waited 5+ years for a funding invitation. For most children, the critical window closes while they're still on the list.
A typical child's journey through the Ontario Autism Program
Example: child registered at age 3, services begin at age 8, after a 5-year wait
Intervention before 6
Research shows 2× greater gains in cognitive and adaptive functioning. Some children lose their diagnosis entirely. The brain's plasticity makes early therapy dramatically more effective.
Intervention after 6
Reduced neuroplasticity means slower progress, higher lifetime costs, and poorer outcomes. Every year of delay narrows the range of achievable milestones. Ontario's waitlist guarantees this for most families.
Of the 71,263 children on the unfunded backlog, the majority were registered between ages 2 and 4. At the current pace, most will age past 6 before receiving any core funding, missing the window that the American Academy of Pediatrics and every major autism research body identifies as critical.
Source: American Academy of Pediatrics (Hyman et al., Pediatrics 2020); Ontario MCCSS OAP registration and funding data via FOI. Wait figure reflects Ontario Autism Coalition community reporting on the May 2026 registration cohort, not a province-wide average. Individual experiences vary. Chart: EndTheWaitOntario.com