I am not sure that being unable to reverse park or parallel park can be called driving OK. These skills are not justused in parking but can be needed when driving in difficult situations and when other people drive badly..
It took me 5 attampts to pass my driving test, I failed on a different manouvre every time, but once I passed I have quite determindly driven every size of car in all kinds of conditions and still do. I have never let motorways or city driving intimidate me.
I have had bad eyesite since the age of 11, so have had regular eye tests all my life and I know my eyesight is upto standard.
I had 2 cognitive tests a couple of years ago and aced them, and no one has commented on any signs of cognitive fall back, and boy, would DD let me know if there was.
I would describe myself as a fair to middling driver, but no more.