Since this talk is sponsored by the NW Universal Design Council, you could rightly guess that one factor that can contribute significantly to aging in place (i.e. staying out of a nursing home) is Universal Design. Universal Design is often defined as products and environments that are usable by all people to the greatest extent without the need for adaptation.
A good example is a single lever faucet, the opposite of two separate faucets for hot and cold. Now there are even touchless faucets for homes, like you’d find in an airport restroom. But the most typical examples are a lever that can be worked for both temperature and flow with an elbow or closed fist.