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You can blanket statement "leave it". In my opinion copper is superior to any of the plastics but ew copper is not the equivalent of old copper. So, inspect the existing plumbing, where it is sound leave it. Where it is questionable replace it.
The question then becomes what material to replace the old with? Personally, I would use copper over Pex or any of the plastics. The new copper is not the same quality as the old and likely will not last sixty years as the old, it may oldy last twenty-five. In all Pex or any of the other products also only have a useful life of twenty-five-ish years.
Concern number one for me is Pex or any of the plastics have a taste, this is a clear indication something is leaching into the water supply. Is this harmful? Time will tell. The plastics are easy to install, and a DIY-er can do it.
Copper doesn't have a tatse but is more expense and takes skill to install if you sweat the pipes.
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