Thailand's revered King Bhumibol Adulyadej waves to guests as he stands next to his wife Queen Sirikit on the balcony of the Grand Palace in Bangkok on his 80th birthday December 5, 2007. King Bhumibol called for national unity on Wednesday at joyous celebrations on the 80th birthday of the world's longest reigning monarch. REUTERS/Royal Palace/Handout (THAILAND).

In this photo released by the Bureau of the Royal Household, Thailand's King Bhumibol Adulyadej, left, accompanied by Queen Sirikit, center, and Crown Prince Vajiralongkorn, waves to cheering crowd from the balcony at the Grand Palace in Bangkok, Thailand, Wednesday, Dec. 5, 2007. Thailand celebrated Bhumibol's 80th birthday Wednesday with festivities, prayers and a nationwide effort to wear yellow — the color that symbolizes devotion to the world's longest reigning monarch. (AP Photo/Buerau of the Royal Household, HO)