1. Improvement of living standards
In the past, people ate coarse grains and lived a dull life with boring and nutritious food. There is no air conditioning in summer and no heating in winter. Ruthless living conditions are eroding the ancients all the time, and daily work day after day and year after year leads to lower average life expectancy of the ancients. Compared with people nowadays, people pay more attention to nutrition. Wear, has been upgraded to pay attention to fashion. All levels are much higher than in ancient times, so it is normal to prolong life.
2. The improvement of medical facilities now
In ancient times, doctors who didn't see a doctor in time when they were ill were not very professional. Although there were many famous doctors in ancient times, such as Hua Tuo and Bian Que, we can see them from ancient times to modern times. There are only a few famous doctors. In ancient times, most people still looked down on doctors when they were sick, but they barely looked up to some mediocre doctors. In ancient times, there really weren't so many imperial doctors who took care of the lives of the ancients.
But what about now? It can be said that almost no one looks down on the disease, and even if there is a government, it will give subsidies. They all went to big hospitals and used advanced equipment to cure everything. Under such a powerful medical system, people's life expectancy will inevitably increase!
3. Gene enhancement
Some people will think it's ridiculous, but you have to admit that the genes of domestic finches can't cultivate goshawk. In the past, the average life span of human genes may be only this. With the above two reasons, the average life expectancy of people is getting longer and longer, which leads to changes in genes and an increase in average life expectancy.
To sum up, the improvement of people's life leads to the increase of people's average life expectancy. With people's attention to health care and the development of medical facilities, people's life expectancy will increase.