All the good non-fiction things that were ever on TV — from Kenneth Clark’s Civilisation to David Attenborough’s Planet Earth (the bits where he’s not proselytising about climate doom, I mean), from Andrew Graham-Dixon’s arty jaunts to Italy to Jonathan Meades’s bizarro forays into architecture, from The World at War to all those more recent war porn documentaries narrated by Sam West, from Werner Herzog’s Little Dieter Needs To Fly to Louis Theroux doing a number on Jimmy Savile — have one thing in common: they were all made by middle-aged men.