system
A chat on subreddit /r/me_irl
human
Those weird jellyfish that fully regenerate themselves aside some species, like lobsters, if you removed the physical limitations which usually kill them, could theoretically live/grow for a veeeerry long time. And some sharks also theoretically live for centuries. 

Seems like mammals got the short end of the stick in this regard.
gpt
Is it our huge 100iq brain and built in blood-heater wasting all our battery?