“Biological Immortality”, is the phenomenon happens when a species reaches a state where it ceases to age, or no longer experiences a further loss of physiological function. Rose suggests humans also experience a biological immortality phase if they are able to live long enough. “You can die, but the idea here is that you are non-aging,” Rose said, “versus aging with a decline of survival likelihood under good conditions.”
https://www.kurzweilai.net/how-to-achieve-biological-immortality-naturally
https://www.kurzweilai.net/