If I can't drive, I suspect I might not be able to bike safely. My dad still drives 20,000 miles a year, but gave up riding a few years ago as he felt too unsteady.
I'm still young at 60, so I figure I've another 25 or 30 years before I have to face that. By that time, everything will have changed so there's no point in worrying now about how far I'll have to go or how I'll get there. I'm ten miles from anything now, but I think that will change in time (hopefully not very soon though).