Having worked on a team responsible for maintaining COBOL code, if from the 80s and not the 60s, it may "last," but it's also a rats nest of dependencies that's

Having worked on a team responsible for maintaining COBOL code, if from the 80s and not the 60s, it may "last," but it's also a rats nest of dependencies that's a pain in the ass to test, and part of the problem of moving away from it is 40 years of undocumented business logic baked into it over the years.