Jem Aswad Executive Editor, Music Fifty may be the new forty in some areas of life, but popular music isn’t one of them. With very few exceptions, pop musicians make their most vital work in their twenties and early thirties, and even if they continue to perform to sold-out arenas into their eighties, as the Rolling Stones have, the fans are largely indifferent to their new music and just want to hear the hits — leading to the seemingly counterintuitive situation of artists with sold-out tours connected to new albums that are, comparatively anyway, flops.