A person does not live forever on Earth — at least not on this earth.
The passage I commented on was “they lived and reigned with Christ a thousand years”. This passage said nothing about living forever. There are no 1000 year periods in heaven because there is no time therefore the passage pertains to time / space ... likely Earth.
I am not sure how one interprets that passage as to NOT refer to a period of time on Earth. But as we all know there is no right or wrong way to interpret Revelations. Just lots of opinions. :-) Cheers