When David Cassidy died, aged 67, in November 2017, reports in the press suggested that legions of middle-aged women were plunged into mourning. Cassidy, whose career was kick-started with the role of Keith Partridge in the 1970s musical-sitcom The Partridge Family, enjoyed explosive success during that decade as a singer, songwriter, and musician, but most sensationally, as the love interest of swathes of adoring teenage girls across North America, Europe, and many other parts of the world.

These days we are …