Life expectancy at birth is the number of years a newborn can live, according to the age-specific mortality standard of the population of its country or region at that time. It is therefore the average number of years that a given population lives, born in the same year. Mathematically, life expectancy is the average age of the people who die in a given year.
Life expectancy is sometimes referred to as the average number of years that a given population lives.
Life expectancy is an important indicator of the quality of life in a region. Women usually have a longer life expectancy than men. The differences by geographic area are evident, while in Europe the average life expectancy is approximately 74 years, in Africa it is 55 years.
You can see the life expectancy ranking by country at Life expectancy by country