Indefinite lifespan

Indefinite lifespan (also known as indefinite life extension or bio-indefinite) 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 "" (that is, they would not be ""), 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 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.

The terms "immortality" and "eternal youth" are often used as synonyms for "indefinite lifespan", but they carry connotations from their other contexts which science has deemed to be impossible. That is, immortal means "incapable of dying". Eternal implies guaranteed existence for eternity, and in this context is also implausible because of entropy. Even if cures were found for all the degenerative diseases, and effective treatments were developed for all the processes of aging, so that bodies could be maintained as easily as cars can be repaired, people would still be killed in accidents, slain in wars, choose to die, etc.

The term indefinite lifespan represents a more achievable state of affairs, because it merely implies freedom from death by aging or infirmity.

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