@jeder Serious answer: I think frequent health assessments (like yearly) should be mandatory to keep a driver's license above age 70. A vision, hearing, cognitive, reaction and traffic rules knowledge test.
@LunaDragofelis they are an active risk for anyone in the proximity of the road, I am reading at least two articles every month about road accidents where they are the culprit.
@jeder my mom is 68 and still a fairly competent driver
though she's always been a careful and defensive driver, that is probably a major factor too
I think that any senior driving health test is supposed to be designed in a way that if one is a danger to other road users, one will fail said test (and then get their license revoked)