The average life expectancy of the population is an important indicator reflecting the health level of the people in a country and region. The sixth national census shows that the average life expectancy of the Chinese population reached 74.83 years in 2010, while the average life expectancy of the population in the early days of the founding of the People's Republic of China was only about 35 years. 
In the early days of the founding of the People's Republic of China, the living environment was more difficult, and people's nutritional level was much worse than it is now.
 the elderly people that people thought more than sixty years ago now seem to be just middle-aged people.