It's true. Because the elderly lack access to information, they can't keep up with the update and change of information. The so-called well-known health experts in the lecture promote health care products in the process of imparting health knowledge, and at the same time make use of the psychology of the elderly who are generally greedy for petty gain and cheap, fabricate facts and exaggerate the curative effect. Some unscrupulous merchants also take advantage of the general greed of the elderly, so happiness and health are a scam.