This is higher than the median age of 21. Developing countries such as Bolivia and Angola. This means that youthful age structures correspond to highly fertile populations, typical of developing countries. The data on sex are also easily obtained. The first of these large cohorts born over a period of 20—30 years are now reaching retirement age, as illustrated by the comparison with the 2002 population pyramid.
The percentage of rural population is higher in farm-based agricultural countries, while industrially, developed regions have higher share of urban population. It supports the bulk of other age groups; it carries the burden of feeding, clothing, educating the young age group and of looking after the old age group. This has happened in the large cities of developing countries as well. The millennial generation is now the largest in the U. Pyramid shape — Regularly tapering. This age group is economically unproductive and the most expensive as it is to be provided with food, clothing, education recreational, health and medical facilities.
Age-sex pyramids also known as population pyramids graphically display this information to improve understanding and ease of comparison. That the pyramid moves stably upward through age 59, then only gradually shrinks inward through age 69, and only gets really narrow after age 79 shows us that people are living long lives, which means that the death rate is low. This age group is largely an economic burden upon the family as it is to be provided with food, clothing and adequate health care under the social security system. The older age structures are those of low-fertility populations, more common to the industrialised nations. Demographers use population pyramids to describe age distribution of populations.
The population pyramid that represents Stage 3 in the demographic transition has nearly vertical sides, with a broad base and relatively broad peak, reflecting reduced fertility, reduced childhood mortality, and increased survival; the older age categories make up a larger proportion of the population than in earlier stages, and the size of the population stabilizes. There seems to be a direct correlation between birth rates and proportion of young population. A side effect of migration on the host country is that it will increase the number of young children too as the people who migrate into the country will be of fertile age and are likely to have children in the new country. Demographic Patterns: Age Structure, Fertility, Mortality, and Population Growth, Jorge del Pinal, Population Division, U. In contrast to this, if the decline in mortality is sharper in lower age group than that in the older age group, it results in the swelling up of numbers in younger age group as is the case with most of the populations of developing countries. This is lower than the dependency ratio in 2000 recorded at 69 dependents per 100 working-age population 63 young dependents and 6 old dependents.
On the contrary, the European countries, with low fertility rate and long life expectancy, have only 20 per cent of their populations in the younger age group. Nevertheless, the trend of an ageing population is also visible in these countries. The bars in the lower half part of the animation represent the percentages of elderly age 60+ , working age population age 20-59 and children or young adults 0-19 in the population. This resulted in a sex ratio of 102 males per 100 females. Demographic development in China — additional information China ranked as the as of 2014 with a population of more than 1. Interpreting population pyramids The shape of the population pyramid efficiently communicates considerable information about the age-sex structure of a specific population.
The Dependency Ratio The dependency ratio shows how reliant young and old people are on the economically active population. For example, the rapid growth of a young adult population unable to find employment can lead to unrest. The developed countries have relatively high proportion of adult population. The age structure of a population affects a nation's key socioeconomic issues. The study of theage and sex structure occupies an important place in demographicstatistics. Advances in medicine and elder care over the years have produced this effect in developed countries. Differences in completed family size range from 8.
A broad base and sharply tapering sides a true pyramid shape reflects high rates and high mortality rates in younger age groups. In the United States the combination has led to the Hispanic ethnic group becoming the largest ethnic minority in the country. They can be stable, meaning that patterns of birth and death are unchanging over time; stationary, which signals both low birth and death rates they slope gently inward and have a rounded top ; expansive, which slope dramatically inward and upward from the base, indicate that a population has both high birth and death rates; or constrictive, which signal low birth and death rates, and expand outward from the base before sloping inward to achieve a rounded peak at the top. Nine regions had an overall dependency ratio higher than the national figure. The sex composition of the population in India is a matter of concern, being much lower than 950 for a long time.
The tendency of people to retire to particular resorts means that in some parts of the South Coast of England the average arithmetic mean age of the population is only just below retirement age. These regional variations are related with the fertility patterns of different countries. The proportion of population in this age group in any country is determined by the stage of demographic transition it is passing through. Japan's total fertility rate is 1. From the sex-age distribution of any population, estimates of school-age population may be made and on that basis, one may arrive at an estimate of the number of educational institutions, teachers, playgrounds, textbooks, etc. The share of older persons in the total population will increase significantly in the coming decades, as a greater proportion of the post-war baby-boom generation reaches retirement. Even in the field of social welfare, the planning of social services for instance, for mothers and children, for the aged, etc.
The graph shows the population distribution in China in 2017, by age group. In oriental societies the elders continue to be looked up to as storehouses of experience and wisdom, and therefore as advisers and consultants. In 2000, the ageing index was computed at 16. Spanish 'flu had their highest mortality among young adults, whose immune systems were presumably insufficiently primed. The reasons put forward for such a state of affairs are: high maternal mortality, female infanticide, sex-selective female abortions, neglect of the girl child leading to a higher mortality among girls at a young age, and change in sex ratio at birth.