about 50% of the audience were teenagers - and they were all wearing pretty much exactly what I would have worn when I was their age. It was very strange - I was having a bit of a wtf moment when a friend of mine (also late 40s) shouted in my ear said exactly the same thing.
(College band as support - the main act were proper grown ups hence why the rest of us were there
- though to be fair the teenagers were pretty damn good)