The problem NotSpaghetti you are suggesting tougher tests for driving skills for older people over younger people. Some young and younger drivers have poor reaction times and alck necessary driving skills. Should ALL drivers have a retest every 10 years.
Having said that, I would add a basic cognition test for over 70 drivers. poor reaction times and failing cognition usually go hand in hand.
I have noticed these days, whenever DH is admitted to hospital or goes to A&E, at some point a doctor or paramedic, whips their beeper out of their pocket and does a quick cognition questionnaire, just covering giving him a one line address to remember then asking day, date, time who is Prime Minster, Monarch and then asking him to repeat the address. He, like President Trump, always aces this test, so that we do not know what happens if you don't, but if, a failure of a quick simple test like this, means a referral for a more extensive test, those whose cognition or response rate is slowing down would soon be picked up.