Just to clarify, PVC is not allowed for indoor water supply-- especially not for hot water (it can't withstand the hot temperatures). The equivalent is CPVC. It tends to have a yellowish / off-white tint. PVC and ABS are allowed for sewage and vent pipes. Honestly, I think the old adage applies in this situation: If it ain't broke, don't fix it! Tearing that all out would be expensive, and unless you could get a decent enough amount selling the old pipe for scrap, it might not be worth the expense. If the plumbing is in good condition and working fine, then I say leave it as is. Now, if there are problems, then you might need to replace sections of it. Maybe you can show some pictures of what the pipes look like (if you can get pictures) so we can see the condition. So long as the drains are not S-trapped, the slope is correct, nothing is rusted, nothing is leaking, and everything is vented properly, it's probably ok to just leave it be.
Replace the galvanized main but leave the copper water piping if the drains are functioning I would leave them but if your updating the whole house maybe would be a good time to replace. Cast iron could be very good if it is not all tore up I would get a sweet camera and inspect the drains before I replaced either way though
My 2 cents, if you plan on staying there for quite awhile, I would replace the drainage, and probably the water pipe. You have gotten the best part of the expectable life span out of the cast iron. Same thing for the copper water pipe, unless you have really good well water. My experience with galvanized for venting is somewhat limited, but what I have seen has seemed to hold up rather well.
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