I prefer walking above all else.
I cycle if it's too far to walk and drive if I can't cycle it.
Macular degeneration for the most part is likely diet related.  A diet high in cholesterol (animal products) will not only steer you towards heart attacks and strokes but also take your sight from you.

http://www.nealhendrickson.com/mcdougall/031200pumacular.htm

As for the elderly driving - I've seen it.  They know that they're having problems; the kids hope that the license doesn't get renewed; the doctor punts and doesn't block the renewal.  In a year or two they eventually come to their senses and the ones I've seen self-restrict themselves to daytime only ....  It's not right - but it's very hard for us to give up something we've taken for granted for decades.

I complained about the lack of free parking at my current employer as I had a decade of free parking under my belt.  I was floored when parking went upto $3 per day - it's cheaper to take the bus and still the parking lots are jammed at this university.