Wow.... This is real 800 years may as well be immortal, given all the scientific advances that would happen in the next 800 years. I would imagine nanotech would be keeping you healthy 'forever' long before 800 years from now. Obviously thats assuming we don't die in an accident or war. Or can't afford the treatment. Actually I think it would probably be suppressed by the government..
If things really happen as per your statement, then there won't be any standing space for us on the planet earth. Have to look for some other earth like objects to colonize in the space
I wish someone would bring something up that'd reduce the lifespan of humans to 8 years or less. That way, we can run over them while they're still kids and say they were going to die anyway.