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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]
Encyclopædia Britannica, a printed encyclopedia, and Wikipedia, an online encyclopedia. An encyclopedia [a] is a reference work or compendium providing summaries of knowledge, either general or special, in a particular field or discipline.
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.