The lift expectancy is the statistical tool that helps in measuring the average life time of an organism is expected to live. This expectations are based upon the year of birth, their current age, and their demographical factors such as sex.
As per the US Census,
The life expectancy of the US will gradually increase over the time. This is due to development in the economy, medicinal changes, and the changes in the easy access to health factors, and many more.
By 2020, the average American is expected to live for 79 years.
To know more about life expectancy, refer to the link:
https://brainly.com/question/7184917
