The free model release form on this page is for adults and covers the use of sound also. For your own record keeping, attach a sheet with thumbnails to the relevant model release form - see further down for links. You could (should) also make a copy of the Model's identification document as proof of age and attach it to your photo release.
Model Waiver for Disabled Children This waiver targets medically fragile individuals including technology dependent individuals who, before the age of 22, would otherwise be hospitalized and are certified as needing hospital or nursing home level of care.
A waiver is a special program designed by a State to cover needed home and community-based services (HCBS) as an alternative to receiving care in an institution such as a nursing home. To become a waiver participant an individual must qualify by meeting certain criteria.