The only concert I attended last year that was not drenched in nostalgia was Taylor Swift’s Eras tour. It was the most successful tour in history, and Swift is the biggest pop star on the planet, so it should not be entirely surprising that I had a total blast at the shows (yes, I went twice). But, according to some, I had no business even being there. A recent survey suggested that four in 10 of people between 25 and 34 think the idea of people in their 50s and 60s attending a Swift gig is embarrassing. It made me wonder how I would have felt, when I went to see Madonna in 1990 as a 19-year-old, if I had spotted anyone in their 50s in the audience. I suspect I would have thought they were quite cool.