# How is life expectancy calculated?

### How is life expectancy calculated?

L’life expectancy at an age x is obtained by dividing the total number of years lived by the cohort beyond the given age x (column 5 – Tx) by the number of survivors at this age (column 2 – Ix).

### How to calculate the lifespan of a person?

It allows to extrapolate the estimated lifespan for a person at a given time. To establish it, we take a control group of 10,000 individuals corresponding to a fictitious generation and count the number of people who died during the reference year. The average lifespans of the members of this control group are thus established.

### How to calculate life expectancy?

To establish it, we take a control group of 10,000 individuals corresponding to a fictitious generation and we count the number of people who died during the reference year. The average lifespans of the members of this control group are thus established. This average is called the life expectancy.

### What is the average lifetime of a generation?

This method makes it possible to predict the average lifespan of a generation before it has completely disappeared. In 2014, life expectancy at birth in France was 79.2 years for men and 85.4 years for women. In 2015, it decreased slightly to 78.9 for men and 85 for women.

### What is the life expectancy at birth in France?

In 2014, life expectancy at birth in France was 79.2 years for men and 85.4 years for women. In 2015, it decreased slightly to 78.9 for men and 85 for women. INSEE explains this decrease by an increase in mortality after 65 years.