Juliana Young Koo, born Yen Yu-yun (Chinese: 嚴幼韻; September 26, 1905 – May 24, 2017), was a Chinese-American diplomat and supercentenarian who worked in the UN Protocol Department. Her first husband, Chinese diplomat Clarence Kuangson Young, was assassinated by Japanese imperial forces during World War II. She became the long-term mistress for the diplomat and politician V.K. Wellington Koo, long before her husband's death. After the war, she moved to the United States; in 1956 Koo divorced his wife and married her.
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Early life
Koo was born on September 26, 1905, into a wealthy family with business and government ties in Tianjin, China as Yen Yu-yün (or Yan Youyun). Her father Yan Zijun (1872–1931) and her grandfather Yan Xinhou (1838–1907) were both prominent businessmen, and her mother was a concubine, although she claimed her mother was her father's second wife; her father's first wife died in 1919, and there was no record that her mother became her father's wife. She attended Keen School at the same year.
She was one of the first women to graduate from Fudan University. At university, a special car took her to campus and brought her back, since its number was 84, the male students nicknamed her "Miss 84".