The Decline of Good Music -- or so they say

Recently I came across this interesting graphic:

The Hubbert Peak Theory of Rock, or, Why We’re All Out of Good Songs

Go check the link, but basically it shows that all the good rock songs (per the Rolling Stone top 500) were mostly in the late 60s and then the 70s, with a gradual decline thereafter. There's even a spurious linkage to the decline of oil from US sources (totally unrelated, really). So, rock is dying, basically.

What a CROCK! Here's my comment posted there:
This whole graphic is merely measuring the general decline with age of those doing the judging of the songs. They like the songs they toked to when they were young, and now remember fondly. They didn’t have babies then. Now, they have houses with mortgages they can’t pay and divorce to contend with, and so they don’t love new music as much. Of course: they’re OLD. FREAKIN’ OLD.
I should know: I’m one. Actually, I do like some new music. And, I’ve been thinking lately that the Rolling Stones weren’t as great as we all thought. And, I do like Green Day. And Jet. And …
So, we’re not ALL old and dried up. Some can still FEEL THE MUSIC. The rest are old farts.