My 18yo son has been failed on such minor technicalities for his driver's licence it's absurd, given the standard of driving we see in Dunedin.
If it's good for one age bracket, it should be reasonable for the other extreme. Make retesting of elderly drivers the norm.

Woman dies, child hurt car crashes into cafe on Auckland’s North Shore https://www.rnz.co.nz/news/national/589245/woman-dies-child-hurt-car-crashes-into-cafe-on-auckland-s-north-shore