I also have to say I see a lot of people approaching middle age engaging in "these kids today!" type behavior.
No, they didn't stop making good music when we turned 30. We just got old. We're not into what the kids are listening to anymore.
I mean... there were plenty of crappy one-hit wonders during Elvis' day too. But since it's 50 years later, we only hear the good stuff.
As a music major in college, I played some absolutely horrid stuff written around the time of Bach and Mozart too. Again, we can gloss over it now and go right for the goods.
Some of my favorite albums, that are great all the way through, have been released in the past couple of years. But it's not really stuff you'd hear on the radio I expect.
Which, really, is just how it was in the past. Most GOOD bands dont get much radio play and never have. Sure you have the occasional monsters that are both great musicians and have popular acclaim, like the Beatles or Johnny Cash, but for every one of them there's 200 Britney Spears' that are a passing fancy.
So investigate off the beaten track a little (especially with all the great tips dropped in the thread) and I'm sure you'll find good music hasn't died after all.