Understood.
I meant it is sensitive with some people, not especially with me.
Yes, you have a point - but it is only a potential risk, not a certainty and that means in practice you are trading a slowly rising risk that might still be very low, balanced by experience and adjusting speed down and only driving in the daytime etc... against someone losing their whole independence (again, not everyone, depends on circumstances).
That's not as simple a call as people make it out to be. There is not one day when you suddenly become a danger on the road.
I like John's approach of having regular assessments of your driving as you get older, so you have an independent appraisal. I'd welcome that becoming mandatory for licence renewal post-70.