Having just discussed that both age and genetic factors have a greater relationship with Alzheimer’s, what about the fact that some people have the same age, or more so, in the same family, and some people develop the disease and others don’t? This is a more complex question, but it can simply be attributed to the fact that there are a number of other causes at play. Research in recent years has also found that Alzheimer’s is also related to the surrounding environment. Some studies have shown that dementia is related to where you live, your economic situation, your level of education and your work situation. Most studies show that the incidence of Alzheimer’s disease in rural areas is higher than that in urban areas; some people even found that, although all the elderly in urban areas, they grew up in rural areas when they were children are more likely to develop Alzheimer’s disease than those who grew up in urban areas. It is clear that the environment in which one grows up has a considerable impact on the development of Alzheimer’s disease. This may be related to the lower economic level of rural areas, the low level of education from childhood, and the low awareness of cultural recreation and health care, which are risk factors for the development of Alzheimer’s disease. We can see some practical situations as well. For example, illiterate, no occupation, little culture and entertainment, usually do not read books and newspapers, do not participate in the activities around, do not communicate with people after retirement, contact only stay at home, social support system is less, have little interest, hobby of the elderly, more likely to get Alzheimer’s disease. The reasons for this are not quite clear. Some people believe that educated elderly people who often read books and newspapers have a wider knowledge base and know more or less about dementia, so it is not easy to be detected, while uneducated elderly people with less knowledge are more likely to be detected through modern testing methods, which makes it appear that the incidence rate of uneducated and uneducated elderly people is a bit higher. However, some people think that the elderly with low culture and little knowledge lack knowledge education and training, and the intellectual reserve in their brains is relatively small and shallow, so once brain aging and intellectual decline occur, it will be manifested more quickly and obviously. And educated, knowledgeable old people, their own brain reserves of intelligence is more, more full, when the same happens when the aging, intellectual decline, and uneducated old people and dementia to the same extent when the time needed to be longer, the performance is slower, not obvious. In this way, we see the phenomenon that the uneducated and uneducated elderly are more likely to get dementia. By the same token, the old people who have work, rich in culture and entertainment, usually read books and newspapers, actively participate in the activities around them, often communicate and contact with people after retirement, have more social support system, and have a wide range of interests and hobbies, the brain’s intellectual reserve itself should be more, and the level of intellect itself is higher, and also often allow the brain to accept the stimulation of new things, so that the brain cells are constantly renewed and used to accept more information from outside world and exercise the brain more, even when the old people have reached the same level of dementia, they are more prone to get dementia. The exercise of the brain is also more, even to the age of aging their brain will not immediately on the decline, intellectual decline will not show very obvious, it is not easy to get Alzheimer’s disease.