i agree with both Arnold and Soixantaine here.
yes older people over 65 years old should be tested, i mean when i am 65 i wouldn't mind being tested again to make sure i am safe, if you are safe you have got nothing to worry about.
saying thats my grandad is 74 years old and drives a kia sedona 2.9 people carrier, now i no wat u r thinking OMG old person driving a BIG car but my grandad is the safest best driver i no. he has got an advanced driving award (means he has a badge on the front of his car) and he is as good if not better than most ppl i no.
however aimed at Soixantaine you gotta agree if some old ppl are driving up the wrong way on the motorway i think they need to be tested again.
well thats my piece