How old is too old to fly?

Cub Driver wrote:
I got my certificate at 68. I had a lot of hours, thus demonstrating
that it is more difficult to learn motor skills in your seventh
decade. So I reckon it must also be more difficult to maintain them.
I am now 72 and recently passed my biennial flight check and medical,
so I am good to go till 74 at least. I have seen nothing to indicate
that I would be a danger to myself or others. However, I almost never
take passengers. For one thing, I enjoy flying by myself; it's part of
the mystique. But mostly I don't think I should subject the innocent
to the hazard--which, because I am a pilot, I know to be greater than
they assume.

Dan, I thought the FAA revised the timeline for medical certificates to
the following:

16-39 three years
40-70 two years
70-75 one year
75-?? six months