“I am turning 80 this year,” declared Anni-Frid Lyngstad with a real sense of pride to the crowds attending the latest performance of ABBA Voyage earlier this year. She made a surprise appearance to support the hugely-successful avatar concert in London and also to show fans how much she appreciates their never-ending love over the past 50 plus years. It’s hard to believe it but the singer from the chart-topping Swedish band who gave us Mamma Mia, SOS and Take A Chance On Me celebrates her