The elderly lack the companionship and care of their children for a long time, and those bad businesses just seize the psychology of the elderly. Sweet mouth is always called by grandparents. Before and after running, it instantly narrows the distance with the elderly, who regard them as grandchildren. With this relationship, it is very easy to sell products to the elderly.
Old people do have various diseases and physical discomfort, and these unscrupulous vendors often exaggerate the functions of their products. Old people are easily deceived because they are suffering from diseases and are eager to alleviate this pain; As the saying goes, that's why you are in a hurry to see a doctor.