DH, aged 81, had an older drivers assessment day, run by the Institute of Advanced Motorists, they found little to comment on in his driving and said he was fine to continue driving. I am the same age.
We both regularly drive distances of 100 miles or more on all kinds of roads, dual carriageways, and motorways and travel to France four or five times a year. We can keep up with traffic, park with precision and neither of our children has said anything about aour driving and DS is happy for his children to travel with us when we are the drivers.
This weekend a driver in his 20s drove into 2 children, killing both and drove on. 4 university students, all in their early 20s were killed when their car was driven into a building. Almost every week, groups of teenagers drive their cars off the road into trees, buildings and ditches and kill everyone.
Yes, the driving of some older drivers deteriorates very quickly. Some 60 year olds are already unsafe on the road, but other drivers can drive safely into their 90s.
In his late 80s my father drove from the south coast to York for his grandson's wedding, refusing offers of transport, he spread the journey over 2 days and on the way back took 4 days as he fitted in a touring holiday around the journey. He drove to our holiday home in Normandy when over 90, again refusing offers of lifts.
In a previous thread on a subject like this, I suggested that from 76 all older drivers renewing their licence should also be expected to provide evidence of a recent eye test and should undergo a basic cognitive test, arranged by the DVLA and probably adminsitered at driving test locations. This would remove from the road those who cannot see properly and whose cognitive skills are fading.