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Disability-adjusted life years (DALYs) are a measure of overall disease burden, expressed as the number of years lost due to ill-health, disability, or early death.It was developed in the 1990s as a way of comparing the overall health and life expectancy of different countries.
This list of countries by life expectancy provides a comprehensive list of countries alongside their respective life expectancy figures. The data is differentiated by sex, presenting life expectancies for males, females, and a combined average.
Old age is the range of ages for people nearing and surpassing life expectancy.People who are of old age are also referred to as: old people, elderly, elders, senior citizens, seniors or older adults. [1]