Don't know what kind of projects you are working on, but in the world where I work, source-code that is literally decades old is common, and companies pay extre

Don't know what kind of projects you are working on, but in the world where I work, source-code that is literally decades old is common, and companies pay extremely good money for people who understand it. This includes things like airline reservation systems, scientific computing models, compilers for obscure dsls, and the like.