A gray-haired woman in her 70s walked down the aisle of a plane, stopped by an empty seat and asked the person sitting next do it, "Excuse me, do you have any grandchildren?" When the very surprised person responded, "Yes, I do!" the woman moved on down the aisle. Asking the same question, the person next to the empty seat stammered, "No, but we wish we did."  Sitting down the woman said, "Wonderful!  Now I will tell you about mine!"