(From bottom L) Dutch Queen Beatrix, German President Horst Koehler and his wife, (from top L) Crown Prince Willem Alexander, his wife Crown Princess Maxima and Mr. Piter van Vollenhoven pose for a official portrait at the Noordeinde Palace in The Hague in this October 8, 2007 file photo. Dutch Queen Beatrix turns 70 on Thursday, prompting speculation she is preparing to abdicate and hand the throne to her son Prince Willem-Alexander just as her mother did on her birthday 28 years ago. [Agencies]