Euro perspective
Age or handicap or money reasons may be a big deal in Europe and they are not non-existent here but old people continue to drive past the point that they should, we have the cheap fuel and cars are available in all prices.
Only the very disabled and the very, very poor don't drive. They would probably not use Mass Transit either.
I support subsidized Mass Transit to get impaired drivers and wrecks off the road and provide the middle class freedom from traffic congestion.
However, you can only subsidize so much and you can't afford to make the mistakes that we have made.