I had this experience a couple of years ago when I went to visit my sister in Richmond and saw the Arctic Monkeys. Truth be told, I was on a college campus, so it’s understandable that I (30 at the time) was a major age outlier in the crowd, but it was really jarring. I remember realizing fairly quickly that I was a solid 10+ years older than everyone, and so from then on it was just a blitz towards drunkenness to forget that fact. I don’t mean to brag, but… Mission accomplished.