As we can see from the above case, Mrs. Wang behaved differently when she was young and when she was old, which makes people sigh: “Age does not spare people”! This also shows that age is an important risk factor for Alzheimer’s disease. Some experts have called for “life in motion”, and all sectors of the community should care about the life of the elderly at different levels in their twilight years, create more opportunities for them to communicate, and provide more venues for their activities, so that more elderly people can have a sense of worthiness and enjoyment in their old age, and this will slow down the incidence of dementia in their old age. Some sources also report that the number of people suffering from dementia increases almost exponentially with age, and the degree of their dementia continues to worsen with age. However, there are many elderly people who still maintain good intelligence, and some continue to shine and excel in their jobs. This goes to show that age is a risk factor for dementia, but it varies from person to person, and there are factors other than age that work together. In general, we all know that when a person is old, his body tissues, organs will be aging, of course, including the human brain system are also aging, degradation, which is usually when we check the head CT shows “brain atrophy”; and human intelligence and brain function is inseparable, so the memory, intelligence will also decline. Elderly people often have more or less cerebrovascular disease, such as cerebral atherosclerosis, smoking and drinking habit, and other chronic physical diseases that affect the blood and oxygen supply to the brain, which leads to insufficient blood supply to the brain, the brain long-term blood and oxygen supply is insufficient, will prompt the brain cells atrophy, deformation, which leads to the brain is not enough.