While gutting out 40 years old house, should we re pipe old PVC pipes?
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As long as the pipes, and I assume you mean drain pipes, were installed properly and are in good condition, I see no reason to replace them.
You could, especially if it shows any sign of deterioration or leaking at any joints.
While not an issue now but given age of the pipes, if it were me personally, I would & replace it with the new PEX plumbing pipes. It doesn't freeze nor burst, plus it's much more flexible. It comes in 3 colors, red, blue, & white which makes it easy to identify hot & cold lines.
PEX is more expensive than PVC, but it's benefits justify the cost. You're already exposing your plumbing, it would make good sense to take steps now to avoid having to go back into your walls for leaks in perhaps not so distant future.
I would, just for my own concerns. Age & heat can deteriate faster.
If they are working properly, I see no reason too.
PVC has a life expectancy of 40 to 50 years, so yes replacing is a good idea.
My vote is yes. I had my plumbing completely replaced, at that time I went from pvc to copper. Still glad I did though. Research what would be best for your climate.