Good point, advertisers don't care about targeting the older generation because they don't think we buy anything. LOL I am past caring what commercial radio does or think. I have my library on a 3x4 Ipod that gives me a greater selection than any radio station could do. We had an oldies station here in Cincinnati on a little AM station, and it didn't make it and now is has degenerated into "God knows what". With the advent of the new technology in the last 10 yrs I'm surprised anyone listens to radio anymore. Anything found on radio, ( music, news, weather, mindless talk) can be found on other sources. The only you don't get are the commercials, and who wants to listen to that anyway.
I have no data to back this up, but I wouldn't doubt that younger folks listen to radio even LESS than us oldsters, since they use hand held mobile devices much more than us old folks. My kids, who are in their 30, seldom listen to radio. Their Ipods have literally thousands of tunes on them and they might tune in to radio for traffic reports but that is all.
I'm not sure why anyone would ever BUY a CD in this day and age. Everything is online. Even the CD racks at Best Buy and other music outlets are so small compared to 10 years ago. I've never been in the industry, but I just can't help but think that the future of commercial radio is pretty bleak.