I would not ' quake' at the thought of taking the test again and would have no hesitation doing so. I am 84 and took my driving test in 1955. Ever since then I have consciously tried to improve my driving by applying techniques recommended in the police driving manual Road Craft and other highly regarded driving publications and TV programmes ( I remember Jackie Stewart produced a fantastic series on safe driving many years ago).
I passed the IAM Advanced Driving Test at 75 and am still a member, always using the System of Car Control. My eyesight is tested every year and is to the standard required for driving. However, I intend to either re-take the IAM test this year or book an assessment by the BSM to see if I've picked up any bad habits. I would have no worries about the theory test or answering questions on the Highway Code. Does all this make me a ' good driver' ? Well, that is for others to asses, but I constantly strive to be ' an improving driver'. Age is not the be and end all; apart from physical considerations, driving attitude, learning from experience, observation and anticipation and concentration are the keys, no matter what one's age.
And as for driving without shoes, I see nothing wrong with it. Light footwear or stockinged ( socks) feet enable much more sensitivity of the controls. Ever tried driving a car in wellingtons or army boots ?
Cheers.
D