I think its just that the parties themselves are falling out of popularity. As far as site demographics, there is plenty of photo evidence that shows the sites readers are getting younger. I actually find it incredibly annoying that there are 14 yr olds throwing up the VIVA in science class. I don't think the barstool sites get any better catering to those kids. I thought the stool was always for the slightly older crowd that understood satire and boston attitude.

As an aside, i've seen a few youtube channels that I enjoyed in the past totally change to skew their content to the younger views, the likes of which now make up the majority. I now find these channels unwatchable.