I have to disagree that Software Development is relatively young. I've been a professional software developer for over 30 years and my father was one before me.
Read some of the older materials. Concepts in software development processes haven't changed since the 60s. Look for the Ten Commandments of Egoless Programming. As true today as when they were created in the 70s.
Stop thinking that today's software development problems are new. They aren't. Look for older materials like the UNIX Philosophy and realize that the newest technology is hiding people problems that have always existed in business for all professions.
Yes, software development have been around since the 60s, but I'd still argue that it's a relatively young industry. Compare it with architecture, gardening, construction or any other industry that builds on knowledge from 1000s of years.
But just like you say, older material might be just as relevant today as it was back then. If anything that should encourage everyone to think more about these issues if we still haven't "solved" them.
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