I have two very quick comments.
One is that only a tiny minority of older people are actually in wheelchairs. Most can walk, probably not very well, but they can walk.
So there are two things. One, as I indicated in my presentation, is to stop people from deteriorating because they lack physical fitness. They lack physical fitness. They get less fit. They're less able to do something.
The other thing is simple adaptations to the home: stair rails, getting rid of trip rugs, rearranging the furniture in somebody's home so they can hold on to the furniture as they walk around. These can keep people active in their own homes. Putting a grab bar in a bathroom, or a rail by a toilet so somebody can easily get out of the seat, raised toilet seats, don't cost a lot of money.