Any one measurement may be inaccurate, but we have tens of thousands spanning everything from geology to biology to astronomy to archaeology to chemistry to physics to actual written history.
The evidence is overwhelming.
Furthermore, Jesus himself was wrong when he said he'd return before that generation had passed away, of which we have ample evidence they thought it meant literally. Only a hundred years later, when they were all dead, did people start coming up with the "hey, it must have been metaphorical" thing.
Furthermore, did you know the Bible doesn't actually have a way to calculate the age of the Earth? Adding up the "begats" and so on was a goofy notion some monk had a thousand years ago. To try to support it with Biblical analysis is, itself, a faulty endeavour just on the face of it, to say nothing about actual detailed analysis.