As a retired plumber I can say that copper water pipes start to leak anywhere from 30 to 50 years. If the pipe has a blue line on it, it is type L tubing and should be closer to 40-50 years. If it has a red line on it, it is type M tubing and 30 is about the life span. Anything after 25 years, it's keep your fingers crossed and hope it last a long time. You may want to look into one of the insurance companies like American Home Shield. With the right coverage, they will cover the complete cost if you have a leak.
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