Glossary

• dementia

  Dementia' is an umbrella term. It describes the symptoms that occur when the brain is affected by certain diseases or conditions. There are many different types of dementia.">dementia although some are far more common than others. They are often named according to the condition that has caused the dementia. Source: http://alzheimers.org.uk/Facts_about_dementia/What_is_dementia/

• Demographic change

  Improvements in health and the related rise in life expectancy are among the most remarkable demographic changes of the past century. For the world as a whole, life expectancy more than doubled from around 30 years in 1900 to 65 years by 2000 (and is projected to rise to 81 by the end of this century; Lee 2003). Most of the historical rise reflects declines in infant and child mortality due to public health interventions related to water and sanitation, and to medical interventions such as vaccine coverage and the use of antibiotics. By contrast, the life expectancy gains observed over the past few decades (especially in high-income countries) and projected into the future are predominantly associated with reductions in age-specific death rates at the middle and older ages. These reductions are typically associated with improvements in medical technology, life-style changes, and income growth. Source: http://www.hsph.harvard.edu/pgda/WorkingPapers/2004/working_paper1.pdf

• Demographic transition

  The demographic transition (DT) is the transition from high birth and death rates to low birth and death rates as a country develops from a pre-industrial to an industrialized economic system. The theory is based on an interpretation of demographic history developed in 1929 by the American demographer Warren Thompson (1887–1973). Thompson observed changes, or transitions, in birth and death rates in industrialized societies over the previous 200 years. Source: http://en.wikipedia.org/wiki/Demographic_transition

• Demography

  The study of populations and population statistics such as size, density, distribution and birth, death and marriage rates. Source: http://www.economics-dictionary.com/definition/demography.html

• dependency ratio

  A simple indicator of the age composition of the population which typically varies in the range 0.5 to 1.00. Early definitions of the dependency ratio refer to the total number of young dependants divided by the total number of persons of productive age. More recently, due to the economic bur-den of ageing populations, the dependency ratio is defined as the total number of young and old dependants divided by the population of working age—for example persons aged under 15 and 65 and over divided by persons aged 15–64, or persons aged under 20 and 60 and over divided by persons aged 20–59 years. Source: http://www.enotes.com/oxsoc-encyclopedia/dependency-ratio

• Forecast

  Estimate future trends by examining and analyzing available information. Source: http://www.investorwords.com/2038/forecast.html

• Generation X

  Generation X, commonly abbreviated to Gen X, is the generation born after the Western post–World War II baby boom ended.[1] While there is no universally agreed upon time frame, the term generally includes peo-ple born in the 1960s and the '70s up through the early '80s, usually no later than 1982. The term had also been used in different times and places for various different subcultures or countercultures since the 1950s. Source: http://en.wikipedia.org/wiki/Generation_X

• Generation Y

  Generation Y, also known as the Millennial Generation (or Millennials), Generation Next, Net Generation, Echo Boomers, describes the demographic cohort following Generation X. As there are no precise dates for when the Millennial generation starts and ends, commentators have used birth dates ranging somewhere from the mid-1970s to the early 1990s. Source: http://en.wikipedia.org/wiki/Generation_Y

• Grey market

  A market consisting of retired people (Note: also called silver market). Source: http://www.glossaryofmarketing.com/definition/silver-market.html