This character is immortal, i.e. they don't have a finite lifespan and could live forever, though the character might still be susceptible to violent death.

It is unknown whether human physical immortality is an achievable condition. Biological forms have inherent limitations which may or may not be able to be overcome through medical interventions or engineering. Natural selection has developed potential biological immortality in at least one species, the jellyfish Turritopsis nutricula.

Use Longevity for those characters that are long-lived, but do have a finite lifespan.