Put down the phone and forget who called; buy things on the street, pay for things forgotten on the counter; see old friends or relatives, often can not call the name …… “really old fogey.” Many people feel that “old and confused” is the result of natural aging, no need to see a doctor to take medicine. However, medical research shows that near memory loss is indeed a manifestation of early dementia (Alzheimer’s disease), but “memory loss” is not necessarily dementia. There are two types of memory loss: physiological amnesia and dementia “amnesia”. The former is a sign of declining brain function and is the norm for the elderly. Such elderly people have a declining memory, but their ability to recognize time, place, relationships and surroundings is not diminished at all. They are not only able to take care of their own lives, but sometimes they can also take care of their family members. In addition, they have seven emotions and six desires. The latter is a pathological organic brain intelligence decline. Such amnesia is completely malignant, and as the disease worsens, they gradually lose the ability to take care of themselves, their thinking becomes increasingly slow, their speech becomes more and more impoverished, they lack a sense of humor, and they are unresponsive. With Alzheimer’s disease, the time from detection to death is usually only 3-5 years, but with early detection and treatment, life can be extended to more than 10 years. The data also shows that if the patient’s life can be delayed by 10 years if it is treated in the first year of detection, then waiting until the second year of detection may only delay the patient’s life by four or five years. Families should be reminded to learn some medical knowledge, timely detection of early symptoms of the elderly, to achieve the three early, that is, “early detection, early diagnosis, early treatment” “early moment of diagnosis, early day to enjoy old age.”