I guess I'm an old fart (mid thirties), comparatively speaking, who's in the same boat. I decided a few years ago to change course in my career path, and got into radio. Initially, I had no idea what I wanted to do, I went to a vocational school, got an internship at a local station, and started at the bottom in promotions.
Now, a few years have passed and I find that anything relating to programming and engineering is my passion and also my forte. What helps me greatly is my background in IT and my basic understanding of electronics. I work a lot with our current CE, sometimes formally, sometimes informally (on and off the clock). Most of what I learn now is on the job, referring to documentation when I need details. Getting a basic understanding of how things work together is an invaluable aid. As has been said, it's about the relationships you build and maintain; I've been fortunate enough to have worked with some very talented folks. Your relationships (and reputation) will have a lot to do with your success.
As I understand it, each company has their own requirements and there is no required set of credentials. My question as it relates to this thread is regarding certifications. Which certifications are highly desirable? And what is the entry point, price-wise, for study materials?