Unfortunately, to ask someone of 75 if they are fit to drive begs the question....are they fit to answer the question? I have had several near misses from older gentlemen who seem to think traffic lanes are there as suggestions only, along with speed limits ( tootling along at 15 miles an hour on a clear road) and lack of signalling in any way shape or form. I believe that over 75 should at least have to re-take the reaction time test. Still it is only a matter of time before we can get into the car and tell it where to drive to with no human interacting at all....