system
Given the following post, respond as if you're commenting on Reddit:
human
[General] You're secretly immortal and have been locked up in a supermax prison for years. You look pretty good for a 70 year old. Breaking out isn't really an option but if you're found out...experiments and stuff. What's the best way to handle this situation? How can you explain it?
gpt
At some point you'll have been in there longer than any other employee or prisoner has been at the prison.  Hell, longer than any of those people have been alive!

Stop socializing with anyone, let them forget you exist.  Then at some point, start insisting that you're actually some other guy.  Tell them it's a computer glitch.  You knew that guy everyone thinks you are, he died twenty years back.  You can't be the person everyone thinks you are because then you'd be over a hundred years old by now.  Do you look a hundred?

You never raised a fuss about it because you did the crime and you deserved the 30 years you were sentenced to.  Felt guilty about it, because you *are* guilty. But, 30 years are up.  Maybe 35 or even 40, you lost count of it yourself.  Aren't they ever going to let you out?

Since you can't be the person they think you are, someone somewhere will believe there's a paperwork error.  You'll be quietly released because they won't want to admit they lost track of a prisoner for decades.