In many cases these two terms are used interchangeably, but some scholars also try to distinguish between the two. For countries with overseas colonies, protectorates or other territorial possessions, their populations are generally excluded. Annual hospitalization rate crude and ageadjusted standardized by the direct method to the year 2000 standard u. World population prospects population division united. Overpopulation definition of overpopulation by merriam. It thus provides an old age related indicator of the number of active people potentially economically supporting inactive people. Dependency ratio does not take into account labor force participation rates by age group. Old age dependency population aged 65 years and over population aged 20 to 64 years 100. This article examines 1 chronological definition of old age and 2 expectations about old age held by young adults in ileife, nigeria. Old age definition, the last period of human life, now often considered to be the years after 65.
O the meaning of old age and the aging experience of in. Population in five year age bands old dependents economically active young dependents females males to the right to the left. Primary data consist of structured interviews of 1. By 2050, this number is expected to nearly triple to about 1.
Percent distribution of elderly population by state of economic independence 34. There are more than 235 million youth in india and 225 million in china alone. The aim of this introductory chapter is to recall the importance and the limits of the genetic definition. Japan and italy dont even make the top 10 see table. The share of the dependent population is calculated as total elderly and youth population expressed as a ratio of the total population. It also gives a broad indication of the age structure of the. Pdf conventionally, elderly has been defined as a chronological age of 65 years old or older, while those from 65 through 74 years old are referred. Census bureau projections, by 2030 adults aged 65 and over are expected to constitute 20% of the total u. Population structure the population pyramid displays the age and sex structure of a country or given area. United nations department of economic and social affairs.
Old age dependency ratio by sex and residence in major states 2001 33 table 3. Reviewing the definition of elderly article pdf available. Definition data refer to the resident population, that is, they are a measure of the population that usually lives in an area. Population ageing is an increasing median age in a population due to declining fertility rates and rising life expectancy. Age groups and the measure of population aging demographic. And many theories in behavioural demography often discarded as too old or too simplistic can be seen as perfectly good scientific theory, useful for many purposes, although often in need of more rigorous. But sustained growth of the worlds older population also presents challenges. A population distribution is a statement of the frequency with which the units of analysis or cases that together make up a population are observed or are expected to be observed in the various classes or catego. Definition demography can be defined as the study of human. Terms and euphemisms include old people, the elderly worldwide usage, seniors american usage, senior citizens british and american usages, older adults in the social sciences.
Overpopulation definition is the condition of having a population so dense as to cause environmental deterioration, an impaired quality of life, or a population crash. Why population aging matters national institute on aging. Realistically, if a definition in africa is to be developed, it. Growth rates are the annual changes in the population resulting from births, deaths and net. The population parameters are presented in table 91, along with the simple data array from which they were derived. Population ageing, which entails an increasing share of older persons in the population, is a major global demographic trend which will intensify during the twentyfirst century. Demographic determinants and speed of population ageing. As a result, the share of elderly people in the total population rises. The number of adolescents and youth today is at an all. Global health and aging who world health organization. The age group examined in this reportadults aged 55 and overis expected to. Population definition, the total number of persons inhabiting a country, city, or any district or area.
Old age dependency ratio by sex and residence, india, 19612001 33 table 3. The old age support rate is the ratio of the population who may be economically active to older people who are more likely to be economically inactive. Growth trajectories and cohort variations in late life depression. The elderly dependency rate is defined as the ratio between the elderly population and the working age 1564 years population. Health characteristics of adults aged years and over. Population structure is the composition of a given population, which is broken down into categories such as age and gender. Japan, italy, and germany top the list of the worlds oldest countriesif the data are based on the share of the population ages 65 and older. Age identity belongs to the domain of the subjective experience of aging. Population meaning in the cambridge english dictionary.
The elderly population is defined as people aged 65 and over. Old age refers to ages nearing or surpassing the life expectancy of human beings, and is thus the end of the human life cycle. The population 65 years and older in the united states. Definitions and concepts demography and population studies the study of human population is known by the two terms demography and population studies. As it is well illustrated by these examples, the concept of population has several meanings. Definitions of more developed regions, less developed regions and. An analysis on the effect of old age dependency ratio on. Population pyramids are graphical representations of the age and sex of a population.
Population aging is a powerful and transforming demographic force. Broadly speaking, population studies is concerned with understanding what are the. The original sample studied in 197172 comprised 30% of the 70year old population. India demographics 2020 population, age, sex, trends. The 2019 revision of world population prospects is the twentysixth round of official united nations population estimates and projections that have been prepared by the population division of the department of economic and social affairs of the united nations secretariat. The 2019 revision of the world population prospects is the twentysixth edition of the united nations population estimates and projections. For this reason, population pyramids are also referred to as agesex pyramids. How will population aging play out differently for lowincome countries that.
Italy demographics 2020 population, age, sex, trends. Every descriptive measure value shown there is a parameter, as it is computed from information obtained from the entire population. Population structure can be used to categorize populations into many subsections and demonstrate population demographics on a local, regional or national scale. New measures and concepts of population ageing have significant implications. Population aging world bank documents world bank group. It presents population estimates from 1950 to the present for 235 countries or areas, underpinned by analyses of historical demographic trends. Minority refers to people who reported their ethnicity and race as something other than nonhispanic white alone in the 2010 census.
Population definition is the whole number of people or inhabitants in a country or region. The next four decades the older population in the united. It is estimated that another jump will happen between 1998 and 20 and the population of the aged in pakistan will grow from 7. The global population aged 60 years or over numbered 962 million in 2017, more than twice as large as in 1980 when there. Population aging now affects economic growth, formal and informal social support systems, and the ability. Canadian women who are 60 years old have a 50% chance of surviving until age 80. The definition of the study population and the sampling process can affect the validity of the research if the study population suffers from sampling error, the study population will not correctly represent the target population if researchers operational definitions of the target population differ, findings might differ across studies. Youth dependency population under age 20 population aged 20 to 64 years 100. Chapter 3 research design, research method and population 3. The lecture notes on population and development provide information on demographic concepts, current trends of population growth, patterns and. Population definition of population by merriamwebster. Most countries have rising life expectancy and an ageing population trends that emerged first in developed countries, but which are now seen in virtually all developing countries. The rising old age problem in pakistan 327 a300% increase of this age group population. This first part of the volume deals with the composition of the populations by presenting the cases of three latin american countries either at the national or at the local level.
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