Gone are the sparkled cowgirls and pop princesses of previous BST gigs. It’s the turn of the Baby Boomer generation to make up the core crowd of Hyde Park – a sea of grey hair, straw hats, and sensible shoes. They reapply sun cream religiously, have brought picnic blankets, and can be forgiven for taking their time getting up and down from the ground between acts. This is the generation that invented outdoor rock and folk festivals – and they’re here to show the rest of us how it’s done.