The out migration of the younger people accounts for the concentration of older people in the mid-west and plains states.
The younger population runs for opportunities to take hold of, for which they leave their place, resulting into out migration of the mid-west and plain states to states which guarantee them a secure future as well as stability. In such cases the only population left behind, is the elderly one.
An increase in the population of the older age groups may result in an increase in government's expenditure on pensions as well as healthcare facilities. This will account for newer challenges for developed nations, in the near future.
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