My home was built in 1961, so nearly 60 years old. I believe the pipes under the home are cast iron (or galvanized). I'm had several issues with the pipes getting clogged and needing to be snaked in the past few years. Recently a plumber put down a camera and saw a lot of flaking and general signs of the pipe being in poor shape. He recommended getting the main sewer line relined. I got two opinions and both recommended the relining. The home is built on a foundation with no access to the pipes, so digging them up is not really an option.
Anyway, I plan to live in this home about 3-5 more years so my question to MMM readers: should I just leave them alone or should I fork out ~$12-17k to get them relined? I am worried that leaving them as is could result in a collapsed line. I got two bids and both plumbers told me it would be tough to sell the house with pipes in that condition. On the other hand, a general contractor told me it's normal for pipes that age to "look rough" but probably ok to leave as they are.