Its a practical issue. Yes the risks must rise a bit as you get to your later years though the stats dont back that up from what I have seen. The biggest issue is the availability of alternatives. Where I live we have no bus service and in any case how would you cope with the Tesco shop on a bus? I suppose the answer is delivery but that doesnt get you out of the house and there are other issues anyway - like getting rubbish down to the dumpit site 20 miles away.
Move house you say? But even at my current 73, the idea of the upheaval that involves fills me with horror. particulalry if it means moving near the kids and getting fathered by my son. He has had that tendency for the last 20 years as is.