The point for us to remember and reflect upon as aging in place professionals is that nothing specifically happens as that personal age odometer turns over from one year (or one decade) to the next. People don't suddenly become less able or require more assistance. While they may indeed be less able than they were a few years previously, it's more of a gradual effect than a sudden one.
In their homes, people don't transition overnight to become less able to stand or sit, walk through doorways, take a shower, reach upper cabinets, operate appliances, open windows, set controls, or performs many other functions like they have up until this time. They don't become any less able, but neither do they gain any appreciable skill either.