If I might ask, what does being on oxygen have to do with it? I keep seeing TV commercials for portable oxygen concentrators, and apparently a big advantage is that they make driving easier.

Anyway, I had to take a break from driving when I had a stroke. That was five years ago.

I slowly regained enough muscle control to be able to drive, but I fatigue quickly, so I don't go very far.

That's kind of a long way of saying that I'll quit driving when I no longer believe I can drive safely.

My condition is different from others, I know. For those who are physically able but challenged by dementia, it's a different story -- they may not be aware that they're a hazard.

Every case is different, and I don't think a specific age plays a role.