I have no comment on the alleged drunk driver.
I am sure his punishment will be as the law dictates 
And they say a copper's never around when you need one!
As to periodic re-tests due to age - I think it should be periodic re-tests regardless of age. say every 5 years.
I got my car ridiculously cheap cos the old bloke that owned it from new "decided" that he wasn't fit to drive any more
at 74
Just to be clear(er) I'm talking across the board. Nout to do with age as such. My eye site, I now know as that's when the headaches started, has been deteriorating since the age of 20. That varies person to person of course.
Although I would like to see more regular test as the years advance. Yearly from 50? Or something along those lines. I feel the uncertainty increasing as I approach junctions, as I get older. The ability to process info quickly diminishing slightly. Driving at night gets harder, rain on the screen at night distracts more... Blah blah. Add in tiredness, from shift work, well you get the picture.
Fork truck drivers are tested regularly. But a vehicle, with passengers, capable of well over the ton, isn't! Yes yes I know there's the the company liability angle but its still a ludicrous situation IMO.