[MargaretR]

I admit that my driving ability is not what it was and I amend my car usage to fit.

For example - night vision - my pupils do not react as quickly as they did, so driving at night on unlit roads is an ordeal, when oncoming headlights (even dipped) temporarily blind me. - So I don't drive outside urban lit areas at night. I think you will find that many older drivers will admit to having that problem.

Another problem is the 'stiff neck'. It is possible to reverse park using mirrors only, but I find it a bit nervewrecking so don't do it. So if I know I am likely to have to do it in town, I either dont go or park and ride into town.

These sort of problems can affect all age groups, but are more prevalent in the older driver.
All drivers of all ages must acknowledge that their abilities have limits, or the alternative is mandatory testing which has been suggested here, which is likely to prevent some people from driving at all times (even when they are within their own set limits).