Here's what I found on the Sick Kids website regarding candidacy:
Criteria for implantationAge
■0 to 18 years
■If deafness is congenital or prelingual, younger children seem to progress faster and benefit more than older children
■If deafness is postlingual (over age 5), children of any age can benefit, if implanted shortly after onset of profound hearing loss
Audiological criteria
■Severe to profound bilateral sensorineural hearing loss
■Limited benefit from hearing aids despite appropriate training and consistent hearing aid use
Speech and Language Level
■The gap between spoken language age and chronological age will need to be be assessed (as this has an impact on the expectations for speech-language success with the implant)
Everything in red indicates Tyler.