We have to renew our licences every 1, 2 or 3 years if we have certain health conditions - depending on the condition and the severity of it - and this also kicks in regardless if your 'condition' is 'being over 70'.
A family member had a particular pertinent health condition (from a very young age) and then also reached the age of 70.
Once he was over 70, the checks and GP tests became more stringent and regular, to the extent that, every year, he found it so thorough that he wondered whether he should just surrender his licence regardless - and indeed he did just that at 79, once a few relatively minor, but cumulative, 'things' also kicked in.
We don't ever have to retake an actual test, purely by dint of automatically having reached a certain age - this is usually only ordered after you lose your licence for a period through dangerous driving, once that period has passed.
Personally, I think that is fair - considering how many younger people frequently say that they would probably not pass after driving for however long; BUT the main idea of passing a test is based on you being a new and inexperienced driver and an unknown quantity.
Once you have been driving for several years, you likely do get somewhat complacent and take some calculated risks in your driving - but this is obviously also balanced out by your experience, so not necessarily 'dangerous' per se.
One thing that I do think is outrageous - disgusting, really - is that drivers are not legally required to have their eyes tested regularly if they are under 70 and don't have any notifiable health conditions.
When the topic has arisen, people I know well have insisted that their eyesight is "fine", and haven't had their eyes tested for, in one case, decades.
Of course, it's the sight equivalent of Mrs Twit's walking stick - where great change can be so gradual over a long time that you wouldn't notice it - and no amount of horror or strong urging on my part that having your eyes tested at the very very least once every five years might be very wise indeed amounts to anything at all, it's just brushed off.
I reckon some people must also know that their eyesight has deteriorated and deliberately don't get it tested, in case they risk losing (or restrictions to) their licence.
Personally, I think it's pointless and utterly stupid to have such stringent procedures in place for those with ceetain health conditions and then to allow somebody to pass a very basic eyesight test at 17 and then not be required to take another one for potentially 53 years, when surely everybody's eyesight will change dramatically - usually not for the better - in that half-century.
What's the point in having your car tested for roadworthiness every year when the driver could be half-blind and in denial or deliberately keeping quiet about it?