I live in a big city, so I see a lot of elderly people. But especially the ones who are not mobile anymore you probably see less. If they were using those tricycle things, I would certainly see them at least some times.

So one out of several billion elderly people. Nice, but not really a proven concept.

My father used to be a doctor in a place that got converted into a pedestrians only area, he reported that a lot of people had issues. Business for other shops also declined.