Understanding Life Expectancy
Life expectancy also can refer to the average number of years a group of people or a specific population is expected to live. Whether referring to an individual or a group, the most common measure of life expectancy islife expectancyat birth, which is the age to which a newborn is expected to live given age-specific death rates at the time of their birth. kali9 / Getty Images Changes in Life Expectancy Life expectancy can change....