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indefinite lifespan
Indefinite lifespan (also known as indefinite life extension) is a term used in the life extension movement and transhumanism to refer to the hypothetical longevity of humans (and other life-forms) under conditions in which ageing is effectively and completely prevented and treated. Their lifespans would be "indefinite" (that is, they would not be "immortal"), because protection from the effects of aging on health does not guarantee survival. Such individuals would still be susceptible to accidental or intentional death by disease, starvation, physical trauma, and so on, but not death from aging. Semantically, "indefinite lifespan" is more accurate than "immortality" which, especially in religious contexts, implies an inability to die.
== Longevity escape velocity ==
(詳細はLongevity escape velocity is a term used in the life extension movement. It is a hypothetical situation in which life expectancy is being increased faster than time is being expended. For example, in a given year in which longevity escape velocity would be maintained, technological advances would increase life expectancy more than that year took away by passing by.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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