I do agree to a point TWR. I am 75 and passed my advanced driving test in 1983. I had a voluntary appraisal in 2004 and passed that. I hope I will have the good sense to realise when I'm not safe on the roads, however, I think I am among the minority. I know two gentlemen in their 90s who definitely shouldn't be driving, one has family, one doesn't. Whose responsibility should it be to stop them? Should I report them? If so, how do I go about it? Would I be vilified if it came out that I had stopped them? It's a minefield, and I think there should be some mandatory test, particularly relating to eyesight, when we reach, for example 80. I wouldn't like to be the person to set it up though!
Having said that, I know some people younger than me who are so nervous on the road and crawl along at 40 in a 60 area, with long tail backs - they are just as dangerous.