Glastonbury fans have been left shocked by Shania Twain's real age, as they took to social media to gush over how good the star looks.The stunning country singer, 58, proved she's not aged a day as she took to the Pyramid Stage to perform in the coveted legends slot for her Glastonbury debut on Sunday 30 June. As the That Don't Impress Me hitmaker took to the stage in a black sequins mini dress, fishnet tights, cowboy boots, and a fedora, fans were left blown away by her age-defying looks.