This article needs additional citations for verification. (August 2007)
Yue Lao appears at night and "unites with a silken cord all predestined couples, after which nothing can prevent their union." He is immortal and is said to live either in the moon or in the "obscure regions" (Yue ming), the Chinese equivalent of Hades. His legends serve as the basis for the Red thread of fate.
A legend is told about the old man under the moon. During the Tang dynasty, there was a young man named Wei Gu (韋固 Wéi Gù). Once he was passing the city of Songcheng, where he saw an old man leaning on his pack reading a book in the moonlight. Amazed, Wei Gu walked up and asked what he was doing. The old man answered: "I am reading a book of marriage listing for who is going to marry whom. In my pack are red cords for tying the feet of husband and wife." When Wei Gu and the old man came together to a marketplace, they saw a blind old woman carrying a three-year-old little girl in her arms. The old man said to Wei Gu: "This little girl will be your wife in the future." Wei Gu thought this was too strange to believe and he ordered his servant to stab the girl with his knife.
Fourteen years later, Wang Tai, the governor of Xiangzhou, gave Wei Gu his daughter in marriage. He was having difficulty finding a suitable match of higher standing for his daughter for even though she was a beautiful young woman, she had difficulty walking and had a large scar on the small of her back. When Wei Gu asked what had happened, he was told that she had been stabbed by a man in the marketplace fourteen years before.
After ten years and three children later, Wei Gu sought the old man for suitable matches for his two younger sons and daughter. The old man refused to find suitors for his children. During the later years, Wei Gu sought to find a possible match for his children but by coincidence, no marriage was put to order.
Yue-Laou (sic) appears as a character in Robert W. Chambers' short story "The Maker of Moons" from the collection of the same name in 1896. He is the leader of Kuen-Yuin, a sect of Chinese sorcerers, and is called "Maker of Moons." He had corrupted "the Xin, the good genii of China" and transformed them into a monstrous composite being: "This monster is horrible, for it not only lives in its own body, but it has thousands of loathsome satellites—living creatures without mouths, blind, that move when the Xin moves, like a mandarin and his escort." In the story, it is revealed that he is the stepfather of Ysonde and is associated with the pack of gold makers. Although he is apparently killed, his body is never found.
In Grace Lin's Where the Mountain Meets the Moon, a novel published in 2009, one of the main characters is named the Old Man of the Moon and seems to have a lot of inspiration derived from Yue Lao and the story of Wei Gu, related above.
- Julie Cheng, Gernot Prunner: Wegweiser zur Völkerkunde, Ausgaben 37-39 im Selbstverlag Hamburgisches Museum für Völkerkunde, 1990, p. 90 
- Yue Laou, in: E. Cobham Brewer, "Dictionary of Phrase and Fable", 1898
- East India Company The Asiatic Journal and Monthly Miscellany Vol. XXVII Published by Wm. H. Allen & Co., 1838, p. 25
- "Old Man under the moon". www.chinatownology.com.
- Ning Huang, Roman Retzbach, Knut Kühlmann: China-Knigge: Chinakompetenz in Kultur und Business, Walter de Gruyter, 2015, p. 256
- "《香蜜沉沉烬如霜》开机 夏志远演绎最萌月老". Tencent (in Chinese). June 16, 2017.
- "Unky Chai". Dislyte. Farlight Pte. Ltd. 2022. Retrieved 17 May 2022.
- Yue Lao, theworldofchinese.com