Although there doesn’t seem to be a general opinion about the length of your resume or CV, my advice is to keep it as short as possible. (exception to this rule is, for instance in the USA, when a full length CV is called for Two, three pages tops should do it. There is no need to provide detailed information about jobs you held a long time ago. Be brief about them. And scrutinize your resume or CV for information that can perhaps be removed. It will improve the readability.