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Recently replaced the pressure tank and manifold for a well pump, and was very nervous about messing with what appeared to be brittle existing pipe between the well and the house. Blue polypropylene.
I couldn't find a lot of information about what to expect, but the pipe turned out to be pliable and not very hard to work with.
Maybe someone will find the information helpful (but be careful, your experience could be different).
Found this (somewhat dense) article before I was willing to mess with it: https://www.researchgate.net/publication/222017412_Prediction_of_the_remaining_lifetime_of_polyethylene_pipes_after_up_to_30_years_in_use
which suggested the useful life of the pipe was another 30 years.