I was at the same show, but I arrived after the doors opened (I had to work before the concert). As soon as I walked into the theater, the security guy was on stage talking about how concerned he was re: people passing out & not moving in the crowd. While I would normally do my best to get as close as possible (while respecting the other attendees around me), I glanced around at the audience & decided to just stand back by the sound area instead. The crowd was pretty nauseating -- there were a few teenage girls taking selfies in the middle of Lana's set, a few other teenage girls were basically twerking & dancing on each other when 'Ride' was being performed, etc.
I had a nice time because Lana was much better live than I expected her to be, the band was wonderful, & Lana seemed sweet as usual, with plenty of kind words for Seattle. That said, I don't think I'll be going to see her live again if her concert demographic remains the same.
I'm a 23 y/o guy, too, just for context, but I was sad to find out that the horror stories regarding Lana's audiences at her concerts were true. A bunch of really obnoxious, mean, & self-absorbed Tumblr-lite teenagers who seem to suck any meaning or depth out of Lana's music & performance. I secretly hope Lana loses them with 'Ultraviolence'...