What do you mean by average life expectancy?

Life expectancy 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 based on the current age-specific mortality rate, but in fact, the mortality rate is constantly changing, so the average life expectancy is a hypothetical indicator.

The average life expectancy is the average number of years that people can survive after living to the exact age of X under a certain age-specific mortality level. It is an index to measure the health level of residents in a country, a nation and a region. It can reflect the quality of life of a society. Socio-economic conditions and health care level limit people's life span. Therefore, the life span of people varies greatly in different societies and different periods; At the same time, due to personal differences such as physique, genetic factors and living conditions, everyone's life expectancy is also very different.

This index is closely related to gender, age and race, so it often needs to be calculated separately. The average life expectancy is our most commonly used life expectancy indicator, which indicates the average life expectancy of the newly born population and is an important indicator to measure the health status of the population.

The length of life is restricted by two aspects. On the one hand, social and economic conditions and medical care level limit people's life span, so the life span varies greatly in different societies and periods; On the other hand, due to personal differences such as physique, genetic factors and living conditions, everyone's life span varies greatly. Therefore, although it is difficult to predict how long a specific person's life will be, it is possible to scientifically calculate and inform the average number of years that everyone can live at birth at a certain death level. This is the average life expectancy.