Japan's Crown Prince Naruhito waves to wellwishers celebrating Emperor [Akihito's] 71st birthday at the Imperial Palace in Tokyo December 23, 2004. [Japan's Emperor said in a statement on Thursday that he has felt downcast since his eldest son Crown Prince Naruhito complained publicly about the stress suffered by his wife Crown Princess Masako, who is under pressure to produce a male heir. Masako was absent from celebratory public appearances by the imperial family.]