Population aging is an increasing median age in a population because of declining fertility prices and rising lifestyles expectancy. Most nations have rising life expectancy and an getting old population (tendencies that emerged first in evolved nations, however that are now seen in truely all developing countries). This is the case for each usa inside the global except the 18 nations special as "demographic outliers" through the UN. The aged populace is presently at its maximum stage in human history. The UN predicts the charge of population growing older within the twenty-first century will exceed that of the preceding century. The wide variety of people elderly 60 years and over has tripled due to the fact that 1950, attaining 600 million in 2000 and surpassing seven hundred million in 2006. It is projected that the blended senior and geriatric populace will reach 2.1 billion via 2050. Countries vary significantly in phrases of the degree and tempo of getting old, and the UN expects populations that commenced aging later can have less time to evolve to its implications.