The word "longevity" is sometimes used as a synonym for "life expectancy" in demography - however, the term "longevity" is sometimes meant to refer only to especially long lived members of a population, whereas "life expectancy" is always defined statistically as the average number of years remaining at a given age. For example, a population's life expectancy at birth is the same as the average age at death for all people born in the same year (in the case of cohorts). Longevity is best thought of as a term for general audiences meaning 'typical length of life' and specific statistical definitions should be clarified when necessary.
Reflections on longevity have usually gone beyond acknowledging the brevity of human life and have included thinking about methods to extend life. Longevity has been a topic not only for the scientific community but also for writers of travel, science fiction, and utopian novels.
There are many difficulties in authenticating the longest human life span ever by modern verification standards, owing to inaccurate or incomplete birth statistics. Fiction, legend, and folklore have proposed or claimed life spans in the past or future vastly longer than those verified by modern standards, and longevity narratives and unverified longevity claims frequently speak of their existence in the present.
A life annuity is a form of longevity insurance.
The Hmong (RPA: Hmoob/Moob, IPA: [m̥ɔ̃ŋ]) are an Asian ethnic group from the mountainous regions of China, Vietnam, Laos, and Thailand. Hmong are also one of the sub-groups of the Miao ethnicity (苗族) in southern China. Hmong groups began a gradual southward migration in the 18th century due to political unrest and to find more arable land. Hmong are rich in culture, art and family and are distinguished by costume/dress (fabric patterns represent fruit, vegetables, farming, chickens, eggs, etc.)
The United States recruited a number of Hmong people to help fight against the communist Pathet Lao, known as the secret war, during the Laotian Civil War. Hmong people were singled out for retribution when the Pathet Lao took over the Laotian government in 1975, and tens of thousands fled to Thailand seeking political asylum. Thousands of these refugees have resettled in Western countries since the late 1970s, mostly the United States, but also in Australia, France, French Guiana, Canada, and South America. Others have returned to Laos under United Nations-sponsored repatriation programs.