First, people's living standards have improved, and rich nutrition intake has led to prolonged life. In the past, because the economy was relatively backward, people didn't have much rich food and couldn't take in more nutrition, so many people were malnourished, which led to a very low life expectancy. But now the economy is developing rapidly, and many people have a good life and are rich in materials. People can get nutrients from different materials. Now people no longer worry about undernutrition, but worry about overnutrition, so the intake of nutrition leads to the extension of people's life span.
Second, the progress of social medical level has prolonged people's life span. In the past, especially in ancient times, the level of medical care was very low and it was expensive to see a doctor, so many people got sick without treatment, and even a small cold could be life-threatening. At present, the level of social medical care is constantly improving. Some diseases were incurable in ancient times, but now with more scientific and advanced means, people's life expectancy has been prolonged. The improvement of people's life span is inseparable from the improvement of modern medical standards.
Third, people pay attention to health, which makes many elderly people very healthy. In the past, people didn't pay enough attention to physical health and didn't know enough about it. But now people attach great importance to health, and arrange physical examination every year to find out the condition in time. Moreover, many old people pay great attention to health, they have a healthy lifestyle, and now many old people have very good physical fitness.
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