Understand. We had a similar experience twice over. My dad developed vascular dementia and was a dangerous driver. We had to hide the car keys and eventually remove the battery from the car. As part of the dementia progression, he, too, was combative, then accepting.
My uncle had Alzheimer’s. Early one Saturday morning, my aunt received a call from the DMV all the way across town to say her husband was there attempting to pass a driver’s test (and failing). Unknown to my aunt, he had left the house before daylight. End of his driving attempts.
It’s hard to see strong, capable persons decline. I know my reflexes and reaction time have slowed. Extra careful now, drive in the daytime and stay at or below the speed limit. Get on the freeway outside of rush hours.
As I've said given the slight "deterioration" I've already seen in myself it's not difficult to imagine that I will eventually become a danger to myself (and others) behind the wheel. I guess the only other option you have to growing old is *not* growing old.