What are the major demographic trends that are problematic from the standpoint of financing programs

What are the major demographic trends that are problematic from the standpoint of financing programs?
like social security and medicare/medicaid in the future? Why are these trends probelmatic and which is more problematic social security or medicare/medicaid?
Economics - 1 Answers

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ageing population = more retirees and less workers. Social security and Medicare tax the workers and give resulting money to retirees. So at current tax and benefit rates, Social Security will go bankrupt by 2050.