Consult "Residential Design for Aging In Place," the key reference for designing homes for aging people, if you seek to understand how to create effective spaces for the elderly. Interior designers, architects, and homebuilders are increasingly asked by clients to design homes to allow for adaptation over time, and this is the definitive guide, endorsed by the American Society of Interior Designers (ASID). Find case study examples of good design solutions for designing for aging in place from two authors who are highly respected fellows of the ASID.
I had hoped for a little more info about how to make a house look un-ADA compliant, yet provide all the ammenities.Instead there were ideas about how wide the arms of a chair should be to allow clearer walkways. I guess it wasn't what I was looking for.