“If you didn’t know that David Hockney was 88, you might think he was in his prime,” said Alastair Sooke in The Telegraph. The veteran artist has lately been producing and exhibiting work at a prodigious rate, and less than a year after his “colossal” retrospective in Paris, he has returned to the UK for a “magical, moving” exhibition, “A Year in Normandie and Some Other Thoughts about Painting”, at London’s Serpentine North Gallery. The show, w…