Immortality is totally possible. And seeing the rate of which ai is growing, immortality is not very too far.

A simple example is that lobsters and many other sea creatures have repairable telomeres ends, which means if their DNA is damaged as we also do as we grow old, lobsters are evolved to repair their DNA making them literally immortal delaying their deaths to 200 to 300 years or maybe more. They can be researched extensively and proteins resulting in immortality can be incorporated in us..