Résumé :
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Many indicators point to an increase in the life span of adults in the developed world since the middle of the twentieth century. For example, the number of people reaching the age of 100 years has never been greater than it is today. These demographic changes raise two main types of questions. The first is whether life expectancy in good health can increase as much as total life expectancy or whether this increase in longevity comes at the cost of an increase in years of life in poor health and/or disability. The second type of question is whether these demographic changes are simply a new transition, after the elimination of infant mortality and premature mortality of young adults, increasing total life expectancy but without changing the characteristics of human longevity, or whether they are more fundamentally the beginnings of a change in the characteristics of human longevity, a real revolution in adult longevity. This technical paper does not claim to answer these questions but simply to present the demographic and epidemiological data that have been accumulating for more than 70 years and that still need to be analysed in order to try to answer these new questions.
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