In old age, health declines. This is obvious, but its implications for social wellbeing are enormous.
In a system where the majority of people have to sell their labor for wages to survive, people's ability to support themselves financially almost always decreases as they age. Without public assistance, therefore, old age is comfortable only for those with savings, and uncomfortable if not downright miserable for those without.
This is why the United States passed the Social Security Act in 1935, which guaranteed a source of income to replace wages for all people 65 and older, along with the Social Security Act Amendments in 1965, which created Medicare, a public health insurance program for the same population. These programs are financed socially, by adjusting the tax rate schedule to accommodate them — that is, by requiring everyone in society to contribute, based on their ability to pay, for benefits that they will be entitled to after a certain age.
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