geezer shopping
An art form of sorts, mastered by older folks, wherein the full geriatric shopping experience, from shelves to check stand, is exceedingly slow and careful and therefore difficult for everyone around to tolerate without triggering impatience and duress.
Take a chill pill, dearie, I’m old - in case you haven’t noticed - and I have earned my right to get out into the world and do some geezer shopping!