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  2. Life expectancy - Wikipedia

    en.wikipedia.org/wiki/Life_expectancy

    Life expectancy, more technically called the curtate expected lifetime and denoted , [a] is the mean of —that is to say, the expected number of whole years of life remaining, assuming survival to age . [152] So, (2) Substituting ( 1) into the sum and simplifying gives the final result [153]

  3. List of countries by life expectancy - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_life...

    This is especially true for Healthy life expectancy, the definition of which criteria may change over time, even within a country. For example, Canada is a country with a fairly high overall life expectancy at 81.63 years; however, this number decreases to 75.5 years for Indigenous people in the country.

  4. Longevity - Wikipedia

    en.wikipedia.org/wiki/Longevity

    Longevity may refer to especially long-lived members of a population, whereas life expectancy is 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 ).

  5. Life table - Wikipedia

    en.wikipedia.org/wiki/Life_table

    Life table. In actuarial science and demography, a life table (also called a mortality table or actuarial table) is a table which shows, for each age, the probability that a person of that age will die before their next birthday ("probability of death "). In other words, it represents the survivorship of people from a certain population. [1]

  6. Old age - Wikipedia

    en.wikipedia.org/wiki/Old_age

    Old age is the range of ages for people nearing and surpassing life expectancy. People of old age are also referred to as: old people, elderly, elders, seniors, senior citizens, or older adults. [1] Old age is not a definite biological stage: the chronological age denoted as "old age" varies culturally and historically. [2]

  7. Human Development Index - Wikipedia

    en.wikipedia.org/wiki/Human_Development_Index

    The Human Development Index ( HDI) is a statistical composite index of life expectancy, education (mean years of schooling completed and expected years of schooling upon entering the education system ), and per capita income indicators, which is used to rank countries into four tiers of human development. A country scores a higher level of HDI ...

  8. Healthy Life Years - Wikipedia

    en.wikipedia.org/wiki/Healthy_Life_Years

    The Healthy Life Years ( HLY) indicator, also known as disability-free life expectancy ( DFLE) or Sullivan's Index, is a European structural indicator computed by Eurostat. It is one of the summary measures of population health, known as health expectancies, [1] composite measures of health that combine mortality and morbidity data to represent ...

  9. Physical Quality of Life Index - Wikipedia

    en.wikipedia.org/wiki/Physical_Quality_of_Life_Index

    The Physical Quality of Life Index (PQLI) is an attempt to measure the quality of life or well-being of a country. The value is the average of three statistics: basic literacy rate , infant mortality, and life expectancy at age one, all equally weighted on a 1 to 100 scale. It was developed for the Overseas Development Council in the mid-1970s ...

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