Which of the following statements is/are correct? 1. Population ageing is the process by which the share of the older population becomes proportionately lesser. 2. In most of the developed countries, the population in higher age groups has increased. Select the correct answer using the code given below :

1. Fundamentals of Population Composition (basic)

When we study population, we don't just look at numbers; we look at the composition—the distinct characteristics that define a group of people. Think of population composition as the 'biological and socio-economic map' of a country. It includes attributes like age, sex, place of residence, occupation, education, and life expectancy. Understanding these traits is vital for governments to plan for schools, hospitals, and jobs.

Two of the most critical pillars of composition are the Sex Ratio and Age Structure. The sex ratio (the number of females per 1000 males in the Indian context) provides insights into the status of women and demographic health. For instance, while India's sex ratio was 972 in 1901, it saw a long decline, hitting a low of 927 in 1991, before recovering to 943 by the 2011 Census Geography of India, Cultural Setting, p.77. Age structure, on the other hand, tells us how many people fall into groups like 'children,' 'working-age adults,' and 'the elderly.'

To visualize this, geographers use a Population Pyramid. This is a bar graph where the age groups are stacked on the Y-axis, and the population size is on the X-axis, with males and females typically shown on opposite sides Indian Economy, Nitin Singhania, Population and Demographic Dividend, p.562. The shape of this pyramid reveals a nation's story:

Pyramid Shape	Meaning	Typical of...
Wide Base	High birth rates and a large young population.	Developing nations (e.g., Nigeria, parts of India).
Narrow Base / Thick Top	Low birth rates and a high proportion of elderly.	Developed nations (e.g., Japan, Germany).

A significant trend in modern demographics is Population Ageing. This is the process where the share of the older population becomes proportionately larger. It occurs when fertility rates decline (fewer children) and mortality rates drop (people live longer). While this phenomenon appeared first in developed nations, it is now a global shift that changes how societies manage healthcare and labor INDIA PEOPLE AND ECONOMY, Population: Distribution, Density, Growth and Composition, p.14.

Sources: INDIA PEOPLE AND ECONOMY, Population: Distribution, Density, Growth and Composition, p.14; Geography of India, Cultural Setting, p.77; Indian Economy, Nitin Singhania, Population and Demographic Dividend, p.562

2. The Demographic Transition Model (DTM) (intermediate)

The Demographic Transition Model (DTM) is a powerful framework used to explain how the population of a region transforms as it moves from a traditional, agrarian society to a modern, industrial one. At its core, the theory suggests that population growth is not random; it follows a predictable path driven by socio-economic progress. As a society moves from being rural and illiterate to urban and literate, it undergoes a transition from a state of high births and high deaths to a state of low births and low deaths FUNDAMENTALS OF HUMAN GEOGRAPHY, CLASS XII, The World Population Distribution, Density and Growth, p.10.

This transition is often described as a demographic cycle. The most critical insight is that death rates usually fall first due to improvements in food security and medicine, while birth rates remain high because of cultural norms. This lag creates a period of rapid population expansion. According to E.G. Dolan, the cycle begins specifically with a fall in the death rate and concludes when the birth rate finally declines to match it Indian Economy, Nitin Singhania, Population and Demographic Dividend, p.558. Understanding these stages allows us to predict the future population trends of any area based on its current level of development.

Stage	Birth Rate	Death Rate	Natural Increase	Context/Society
Stage 1	High	High	Low/Stable	Agrarian; high mortality due to epidemics and variable food supply FUNDAMENTALS OF HUMAN GEOGRAPHY, CLASS XII, p.10.
Stage 2	High	Falling	Very High	Initial industrialization; improved sanitation and healthcare. Often called the "Population Explosion."
Stage 3	Falling	Low	Slowing down	Urbanizing; higher literacy and deliberate family planning. Growth rate starts to taper.
Stage 4	Low	Low	Low/Stable	Fully developed; urban-industrial society with high life expectancy.

Sources: FUNDAMENTALS OF HUMAN GEOGRAPHY, CLASS XII (NCERT 2025 ed.), The World Population Distribution, Density and Growth, p.10; Indian Economy, Nitin Singhania (2nd ed. 2021-22), Population and Demographic Dividend, p.558

3. Key Demographic Indicators: TFR and Life Expectancy (intermediate)

To understand how world population patterns shift, we must first master two fundamental steering wheels: Total Fertility Rate (TFR) and Life Expectancy. TFR represents the average number of children born to a woman during her reproductive years. A crucial benchmark here is Replacement Level Fertility (RLF) — the rate at which a generation perfectly replaces itself. Globally, this is set at 2.1 rather than a simple 2.0. This extra 0.1 accounts for infant mortality and the fact that some women may not survive to or through their childbearing years Indian Economy, Vivek Singh (7th ed. 2023-24), Inclusive growth and issues, p.258. Interestingly, India has recently crossed a major milestone; according to the latest National Family Health Survey (NFHS), our TFR has dipped to 2.0, which is officially below the replacement level Indian Economy, Nitin Singhania (2nd ed. 2021-22), Population and Demographic Dividend, p.569.

You might wonder: if India's TFR is below replacement, why is our population still growing? This is due to Population Momentum. Because we have a massive base of young people currently entering their reproductive years, the absolute number of births remains high even if each individual woman has fewer children. This growth is further bolstered by a steady rise in Life Expectancy — the average number of years a person is expected to live at birth. Life expectancy serves as a mirror of a nation's healthcare quality and nutritional standards. For instance, while India's life expectancy stands at approximately 67.7 years, our neighbor Bangladesh has seen it rise to 73.7 years, reflecting different trajectories in social development Understanding Economic Development, Class X NCERT (Revised ed 2025), DEVELOPMENT, p.12.

Indicator	Primary Impact	Current Indian Context
Total Fertility Rate (TFR)	Determines the 'birth' inflow into the population.	Declined to 2.0 (below replacement level).
Life Expectancy	Determines how long individuals remain in the population.	Consistently rising due to better health interventions.

As TFR falls and Life Expectancy rises, a nation undergoes a demographic transition. The 'bottom' of the population pyramid (children) starts to shrink, while the 'top' (the elderly) begins to expand. This process, known as population ageing, was once a phenomenon exclusive to developed OECD nations, but it is now accelerating in developing countries as well. By 2041, the share of India’s young population (0-19 years) is projected to drop significantly to about 25% Indian Economy, Vivek Singh (7th ed. 2023-24), Inclusive growth and issues, p.258.

Sources: Indian Economy, Vivek Singh (7th ed. 2023-24), Inclusive growth and issues, p.258; Indian Economy, Nitin Singhania (2nd ed. 2021-22), Population and Demographic Dividend, p.569-570; Understanding Economic Development, Class X NCERT (Revised ed 2025), DEVELOPMENT, p.12

4. Demographic Dividend vs. Dependency Ratio (exam-level)

To understand the economic trajectory of a nation, we must look at its Age Composition. This isn't just a count of people, but a map of who produces and who consumes. At the heart of this study are two twin concepts: the Dependency Ratio and the Demographic Dividend. While they sound like technical jargon, they essentially describe whether a country is carrying a heavy 'load' or riding a 'tailwind' of growth.
The Dependency Ratio measures the pressure on the productive part of the population. It is calculated by taking the 'dependents'—those typically too young (0-14) or too old (60/65+) to work—and dividing them by the 'working-age' population (usually 15-59 or 15-64). As noted in Indian Economy, Nitin Singhania, Population and Demographic Dividend, p.573, a high dependency ratio means fewer workers are supporting more non-workers, which can strain a country's resources. Conversely, a falling dependency ratio is a positive indicator; for instance, India’s ratio dropped from a heavy 79.3 in 1970 to 49.2 in 2019, signaling a shift toward a more productive structure.
This shift leads us to the Demographic Dividend. This is the additional economic growth that occurs specifically because the share of the working-age population is expanding while the share of dependents is shrinking. It is a 'window of opportunity.' According to Indian Economy, Vivek Singh, Inclusive growth and issues, p.259, India’s dividend is expected to peak around 2041, when the working-age population (20-59 years) will hit roughly 59% of the total. However, this is not a guarantee of wealth; it is only a potential. If the working-age population is not skilled or employed, the dividend can turn into a 'demographic disaster.'
The transition between these states is summarized in the table below:

Feature	High Dependency Phase	Demographic Dividend Phase
Age Structure	High proportion of children or elderly.	Bulge in the 15–59 (or 20–59) age bracket.
Economic Impact	Resources diverted to schools or healthcare/pensions.	High savings and investment due to more earners.
Global Context	Common in very young nations or 'aging' developed nations.	Currently seen in developing nations like India.

It is important to note that this 'dividend' eventually fades. As the birth rate stays low over decades, the working population eventually grows old, leading to Population Ageing. In developed OECD countries, the share of the elderly is projected to exceed 21% by 2050, turning the dividend back into a high dependency ratio, but this time driven by the 'geriatric' (senior) population rather than children Geography of India, Majid Husain, Cultural Setting, p.95.

Sources: Indian Economy, Nitin Singhania, Population and Demographic Dividend, p.573; Indian Economy, Vivek Singh, Inclusive growth and issues, p.259; Geography of India, Majid Husain, Cultural Setting, p.95

5. The Concept of Population Ageing (intermediate)

Population ageing is a demographic process where the proportion of older persons in a population increases relative to other age groups. It is not merely a reflection of individuals living longer, but a fundamental shift in the age structure of an entire nation. This phenomenon is primarily driven by two simultaneous trends: a long-term decline in fertility rates (fewer children being born) and a decline in mortality rates (increased life expectancy). As the number of children at the 'bottom' of the population pyramid decreases and the number of elderly at the 'top' increases, the median age of the population inevitably rises. Historically, population ageing emerged first in developed countries. These nations have undergone a full demographic transition, resulting in a significant share of their population being aged 60 or 65 and above. For example, many OECD countries are projected to have over 21% of their population in the elderly bracket by 2050. In contrast, while developing countries like India are currently benefiting from a 'demographic dividend' with a large working-age population Indian Economy, Vivek Singh, Inclusive growth and issues, p.259, they are also beginning to see a steady rise in their senior citizen (geriatric) cohort. In India, the elderly population rose from 5.1% in 1901 to 8.0% by 2011 Geography of India, Majid Husain, Cultural Setting, p.95. This shift has profound socio-economic implications, particularly concerning the dependency ratio. As the proportion of elderly people grows, governments must redirect resources from sectors like primary education to geriatric healthcare, social security, and retirement benefits Geography of India, Majid Husain, Contemporary Issues, p.74.

Feature	Young Population	Ageing Population
Primary Driver	High fertility rates	Declining fertility & mortality
Median Age	Low (often below 20-25)	High (rising toward 40+)
Resource Focus	Schools, Pediatrics, Job creation	Pensions, Geriatrics, Assisted living
Economic Phase	Expanding workforce (Dividend)	Potential labor shortages

Sources: Geography of India ,Majid Husain, (McGrawHill 9th ed.), Cultural Setting, p.95; Geography of India ,Majid Husain, (McGrawHill 9th ed.), Contemporary Issues, p.74; Indian Economy, Vivek Singh (7th ed. 2023-24), Inclusive growth and issues, p.259

6. Global Patterns: Ageing in Developed vs. Developing Nations (exam-level)

Population ageing is a demographic process where the share of the older population in a country becomes proportionately larger over time. This is primarily measured by an increase in the median age of the population and a rising percentage of people aged 60 or 65 and above. It is a dual-result of the 'demographic transition': a long-term decline in fertility rates (fewer children being born) combined with a decline in mortality rates (people living longer). While a growing population might require more foodgrains and employment, the age structure specifically dictates how a government must distribute its resources Geography of India, Majid Husain, p.74. For example, a 'young' population requires heavy investment in schools, whereas an 'ageing' population demands massive spending on healthcare, pensions, and retirement benefits. Historically, population ageing emerged first in developed nations. These countries, many of which are members of the OECD (Organisation for Economic Co-operation and Development), are characterized by high-income economies and high Human Development Index (HDI) scores Indian Economy, Nitin Singhania, p.533. In these advanced economies, the proportion of elderly people is already very high; it is projected that by 2050, over 21% of the population in most OECD countries will be aged. Most of these 37 member nations follow free-market principles and democracy, maintaining their headquarters in Paris History, Tamilnadu State Board, p.256. In contrast, developing nations (like India and China) are currently in a different phase. While they still have a significant proportion of young people, the trend of ageing is now accelerating in these regions faster than it did in the West. This creates a unique challenge: these nations may 'grow old before they grow rich,' needing to build robust social security nets while still managing the needs of a large working-age population.

Feature	Developed Nations (e.g., OECD)	Developing Nations (e.g., India)
Current Status	Advanced stage of ageing; high median age.	Transitioning; currently have a 'youth bulge'.
Primary Concern	Shrinking workforce and high pension costs.	Creating jobs while preparing for future ageing.
Health Focus	Geriatric care and chronic age-related diseases.	Maternal/Child health, though geriatric needs are rising.

Sources: Geography of India (Majid Husain), Contemporary Issues, p.74; Indian Economy (Nitin Singhania), International Economic Institutions, p.533; History (Tamilnadu State Board), The World after World War II, p.256

7. Solving the Original PYQ (exam-level)

This question serves as the perfect synthesis of the Demographic Transition Model and Population Geography concepts you have just mastered. To arrive at the correct answer, you must apply the logic of how declining fertility rates (fewer births) and declining mortality rates (longer life expectancy) fundamentally restructure a nation's population pyramid. The building blocks come together here: when people live longer and fewer children are born, the median age of the population naturally climbs, leading to what we define as an ageing society.

Let’s walk through the reasoning as a seasoned aspirant would. Statement 1 contains a classic UPSC word-swap trap; population ageing is the process where the share of the older population becomes proportionately larger, not lesser. By substituting one simple word, the examiner tests whether you are reading for meaning or just skimming. Statement 2 is a factual reflection of the post-industrial stage of development. In developed countries, advanced healthcare and socio-economic shifts have caused the proportion of people in higher age groups to rise significantly. Therefore, the correct answer is (B) 2 only, as highlighted in Population ageing - Wikipedia.

Why are the other options incorrect? Options (A) and (C) are wrong because they rely on the logically inverted definition in Statement 1. Option (D) is incorrect because Statement 2 is a globally recognized demographic reality. Pro-tip: Whenever you encounter a definition-based statement in the UPSC Prelims, always pause to check the direction of the trend (e.g., larger vs. smaller, increasing vs. decreasing), as this is where the examiners most frequently hide errors.