system
A chat on 4chan
human
Biologically? Sure, there is organisms that can live forever as long as they have resources. But humans are very different, maybe in the future when we fully understand our bodies and the organisms that live forever, then maybe we could modify our genes to live forever. But it's a big maybe.
gpt
what organisms would that be? because i dont think there are.
human
Immortal Jellies (they renew in flesh cocoon they make for themselves and come out as babies again). 

Hydras (virtually immortal so long as well fed). 

Then Lobsters (theoretically no upper limit to their age, but they grow in size relative to their age, so eventually they become too slow, too diseased, or even too lazy to molt out of their old skin and die encased in...themselves really).
gpt
>they die, but in theory are immortal, if they don't!
gr8 examples. suprised you didnt say cancer cells...