I'd argue that code does rot. 1. Cobol. Seems like most crowd here on HN thinks of it as a problem, contrary to what Joel says. 2. Security -- old code that's

I'd argue that code does rot. 1. Cobol. Seems like most crowd here on HN thinks of it as a problem, contrary to what Joel says. 2. Security -- old code that's not being updated is often insecure. E.g. it requires old environment, that's not being supported anymore, so no security patches for you. 3. Motivation -- the older a project gets, the more you need to pay for its maintenance.