A callow 20-something Paul McCartney thought that the 60s were a time for knitting “a sweater by the fireside” and “doing the garden, digging the weeds” (“When I’m 64”, Sgt Pepper’s Lonely Hearts Club Band). Ironically at 82, McCartney is doing just the opposite. Instead of staying at home and playing with grandchildren, he is busy touring to packed auditoriums.