Most elderly people drive 7 to 10 years longer than they should. They also crash more than all drivers except those under the age of 25, and they're more fragile and likely to die. There's no practical way to set an age to stop, and it would meet strong resistance anyway.

The crux of the problem is when people stop driving, they also lose a significant amount of independence and control. The best way to stop is to decide for yourself and do it. The worst way to stop is to have someone say you must. Kaiser Permanente offers a questionnaire that is a decision tree to help you decide when and whether or not to stop for yourself.

The National Institute on Aging offers a comprehensive web page on the topic of safe driving for older adults. It explains:

a) Medical conditions and ability to drive as you age.

b) Tips to help you drive safely.

c) Resources to check and improve your driving.

d) Help to recognize the problem in someone else.

e) Help to recognize when to stop on your own.

Finally, you need a plan for transportation after you stop. First, decide whether you will you keep your car or not. If you keep it, you only need a driver (possibly someone helping you now that can drive too). If you don’t, you still need a driver, but one that comes with transport.

a) The car lets you plan where (and when) you want to go, rather than fit your destination(s) and schedule to a rideshare or bus route.

b) Letting the car go saves money on insurance, maintenance, garaging, which can hire Uber or taxi rides. A starting place for senior transportation (for disabled and not) is Rides in Sight.