The secret life of Sylvester Stallone, still Hollywood’s most durable action hero

He’s the sensitive Edgar Allan Poe-loving loner who once turned up at Cannes on top of a military tank; the Reagan-era Rambo, teasingly named “Thumbo’’ in his latest film, but still landing plum roles into his late seventies. As a testosterone-tinged Netflix show on Sylvester Stallone airs, Geoffrey Macnab looks back on his rip-roaring life and career.