Commiserations on that, and yeah... cast iron generally has a 5-10 year life span, if you don't get a lot of ground penetrating cold or nobody puts anything too acidic or salty in the waste water.

Which is a hell of lot less than glazed pottery, I mean, there's places out in the middle east that are still using mesopotamian piping from about 4,000 years ago! Here, London still uses Roman sewer pipes in places.