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> It was factual that the earth was 6000 years old, until it wasn't.

This is the opposite of the example you seem to think it is. The Earth has always had the same actual date of origin. If it is not factual now that the Earth is 6,000 years old, then it wasn't before either. The whole argument here is that people's perceptions and reality can in fact be different.




> The Earth has always had the same actual date of origin.

Maybe, but I'm asking: can you show that peoples' perceptions match/differ from reality, without relying on perceptions being factual/reliable?

If not, then how do you know that reality is fixed?




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