Noun explanation of life span

The average life expectancy of the national population refers to the average number of years that people born in the same period can expect to live if the current age-specific mortality rate remains unchanged. It is not an actual data, but an important indicator to measure the population health status of a specific country and region based on the life table, which has an important relationship with the birth rate and mortality rate.

In short, the average life expectancy is to assume that a group of people, starting from the age of 0, will gradually shrink until the last person dies according to the current mortality rate of all ages. The average age of death of these people is life expectancy.

Extended data:

Life expectancy per capita reflects the current level of death. Although it is called life expectancy, it doesn't mean how old these people can really live. Because it is calculated according to the current mortality rate, the mortality rate is constantly changing. For example, the life expectancy of these people born now is 74 years. After many years, the medical level has improved, and they may live to 100 years old.

The average life expectancy is calculated by the mortality rate, so the factor affecting its level is the mortality rate. To achieve the goal of "increasing the average life expectancy by one year", it is necessary to reduce the death level.

Baidu Encyclopedia-the average life expectancy of the national population