The full impact of a graying America was brought home to many retailers last month as seniors lined up en masse to get flu shots.
Supermarkets were caught by surprise by an unprecedented nationwide flu vaccine shortage. They had to work hard at balancing the needs of regular shoppers against the overwhelming attendance at flu shot clinics, usually with lines winding through store aisles.
"We had huge crowds. We probably turned away as many or more as we were able to give the v