A couple of resources are:
http://billyoh.com/resource/benefits-of-gardening-older-adults
http://www.gardenbuildingsdirect.co.uk/resource/gardening-tips-physical-disabilities-and-elderly/
A couple of resources are:
http://billyoh.com/resource/benefits-of-gardening-older-adults
http://www.gardenbuildingsdirect.co.uk/resource/gardening-tips-physical-disabilities-and-elderly/
See this from the Compost Council of Canada