India's Population Divide Puts Jobs, Ageing and Parliamentary Seats on Different Paths

A Younger North and an Ageing South

India's working population is projected to peak at 1.01 billion in 2041, but the opportunities and pressures behind that number will be distributed unevenly. Bihar and Uttar Pradesh will continue adding large numbers of young people, while Kerala, Tamil Nadu, Andhra Pradesh and Telangana move towards population stability and an older society.

A report by the International Institute of Migration and Development (IIMAD) and the Population Foundation of India (PFI), titled "Unravelling India's Demographic Future: Population Projections for States and Union Territories, 2021-2051," projects that India's population will increase from 1.35 billion in 2021 to approximately 1.59 billion in 2051. The 2021 baseline is also given as 1.36 billion in the headline figures.

As of January 23, 2026, this regional divide connects several pressing debates: how to create enough jobs for young people, how to support an ageing population, where workers will move, and how parliamentary seats should be shared among states.

India's demographic dividend, the economic opportunity created by a large population of working age, is becoming a story of different regional timetables. A state with many young adults needs education and employment on a large scale. A state with fewer children and more older residents faces a changing balance between workers, schools and care needs.

Poonam Muttreja, executive director of Population Foundation India, described the limited time available to turn the country's young population into an economic advantage:

India has a fantastic window of opportunity but it will only be there for approximately the next two decades," said Poonam Muttreja. "We have the capacity to tap into the potential of the youth population but we need to invest in adolescent education, health and sexual health right away if we want to reap the benefits.

Population Growth Is Slowing, but Unevenly

The IIMAD and PFI report uses the cohort-component method to project population changes. This approach follows groups of people through successive ages to estimate how the size and composition of the population will develop.

India's projected annual population growth rate is slowing to about 0.5 percent. The country is expected to remain the world's most populous nation, even as the pace of expansion moves away from the rapid growth that shaped decades of political and academic concern about a "population explosion."

The National Population Policy 2000 set a target of population stabilisation by 2045. That target now appears out of reach, with stabilisation likely to require about two additional decades. Slower growth and stabilisation are different stages: a population can continue getting larger even when the rate at which it grows is falling.

Bihar is projected to record average annual growth of 1.1 percent, followed by Uttar Pradesh at 0.9 percent. Rajasthan and Madhya Pradesh are also among the northern and central states expected to grow faster than the national average. Together, these regions will account for much of India's additional population.

Kerala, Tamil Nadu, Andhra Pradesh and Telangana are expected to grow well below the national average. Their fertility transition, the shift towards smaller families, is largely complete, bringing them closer to near-zero population growth.

The southern region's share of India's population is projected to fall from 20 percent to 17 percent by the middle of the century, a decline of three percentage points. The combined share of the northern and central regions is expected to rise from 48.6 percent to 52.7 percent, an increase of 4.1 percentage points. India's population will become more concentrated in the north and centre.

The Age Gap Will Widen

By 2036, the average Tamil man is projected to be more than 12 years older than the average Bihari man. This difference captures how far apart states can be in the same country's demographic transition.

Kerala reached replacement fertility in 1998, while Bihar is not expected to reach it until 2039. Replacement fertility is about 2.1 children per woman, the level used to describe families having enough children to replace their parents' generation over time.

India's population pyramid in 2011 had a broad base, reflecting a large number of children and young people. By 2051, the national shape is expected to become more rectangular, with a more balanced but progressively older age composition. Northern states will still have a larger concentration of young people, while southern states will have a greater concentration of older residents.

The main milestones show that the transition extends across several decades:

• 1998: Kerala reached replacement fertility.
• 2000: The National Population Policy set a stabilisation target of 2045.
• 2011: India's population pyramid retained a broad, youthful base.
• 2036: The average Tamil man is projected to be over 12 years older than the average Bihari man.
• 2039: Bihar is expected to reach replacement fertility.
• 2041: India's population aged 15 to 59 is projected to peak at 1.01 billion.
• 2051: India's population is projected to reach approximately 1.59 billion, with an older national age profile.

Why Parliamentary Boundaries Matter

The demographic divide is also feeding a political dispute over delimitation, the process of redrawing parliamentary constituencies according to population data. Constituencies are the areas whose voters elect representatives to parliament.

India's Constitution provides for seats in the Lok Sabha, the lower house of parliament, to be allocated to states according to population. However, the allocation has been frozen using the 1971 census figures to encourage population control.

The freeze is described as due to expire after the census due in 2026, making that year a focus of the debate. Southern states fear that a fresh allocation based on population will reduce their influence because their populations have grown more slowly.

Population growth and parliamentary representation are therefore pulling the regions into competing arguments. Southern leaders say their states should retain political weight after successfully implementing family planning and development policies. Northern leaders argue that larger populations need more representatives under the democratic principle of "one person, one vote."

The final allocation of seats is not yet given. The figures being discussed are projections of what a redistribution based purely on population could produce.

The Dispute Over Seats and Economic Contribution

Uttar Pradesh, Bihar and Madhya Pradesh are expected to gain seats under a redistribution based on current population figures. Kerala, Tamil Nadu and Andhra Pradesh stand to lose representation. Estimates suggest the north could gain as many as 43 seats while the south loses 24.

MK Stalin, chief minister of Tamil Nadu, has described the prospect of reduced southern representation in stark terms:

Damocles' sword hanging over southern India.

Southern states argue that a population formula would penalise their success in reducing family size. Their objection is also economic: they say they contribute disproportionately to India's gross domestic product and tax revenues.

Tamil Nadu contributes roughly 8.4 percent of India's GDP while accounting for about 6.5 percent of its population. GDP measures the value of goods and services produced in an economy. The state's share of economic output is therefore 1.9 percentage points higher than its population share.

Southern leaders contend that reducing their parliamentary representation solely according to population would be unfair and weaken cooperative federalism, the principle that the national government and states work together. Northern leaders point to the infrastructure and development needs of their larger populations as reasons for greater representation.

The dispute brings two priorities into the same decision: representation for the number of people living in each state, and recognition of states that pursued population control. The different growth paths make that balance increasingly contentious.

Workers Are Moving Towards Southern Jobs

Bengaluru, Chennai and Hyderabad are attracting workers from states such as Bihar and Uttar Pradesh as the north's supply of young labour meets the south's demand for workers. Internal migration is becoming a practical response to the demographic mismatch.

Southern states face a potential labour shortage as their populations of working age shrink and grow older. Northern states have more young people entering the job market. Moving between regions allows workers to seek employment where demand exists.

This movement is sometimes called replacement migration. In this context, migrants help fill jobs left open as a region's own workforce becomes smaller. They contribute to the economy where they work and can send money, known as remittances, to families in their home states.

Migration has also prompted resistance from people who fear competition for jobs and resources. Political rhetoric favouring local residents has appeared in some southern states, complicating the economic relationship between regions.

Karnataka has considered legislation to reserve jobs for local people. Such measures face legal and constitutional challenges. The tension is between employers' need for workers, migrants' search for livelihoods and local demands for access to employment.

Migration to the Gulf Is Shifting North

Kerala has historically been a major source of workers heading to Gulf countries. As its population of working age declines, the geographical balance of India's labour migration to West Asia is shifting towards northern states.

Emigration clearance data show a sharp fall in the number of clearances issued to workers from Kerala and Tamil Nadu. Uttar Pradesh and Bihar now account for a substantial and growing share of the workforce travelling to West Asia.

Remittances make this change economically important for the states involved. Money sent home by workers abroad remains a vital source of income for many Indian states. A shift in where overseas workers come from can also change where that income reaches households.

Internal migration and overseas migration connect the same demographic pressures to different destinations. Within India, southern economic hubs need workers. Beyond India, northern states are supplying a growing share of workers heading to the Gulf as the traditional southern sources age.

Fewer Children Are Changing Schools

India's school system is already experiencing the effects of declining fertility. Data from the Unified District Information System for Education (UDISE+) show that enrolment from pre-primary through class 12 fell by 13.4 million students between 2018-19 and 2024-25.

The decline has led to the closure or merger of approximately 80,000 schools across the country, including 70,000 government schools. Lower enrolment changes how many schools are needed and how existing facilities can be used.

Southern states, where there are fewer children, are seeing the closure of schools described as "uneconomic." These are schools whose reduced enrolment makes continued operation difficult to justify in their existing form.

Northern states are experiencing another change alongside smaller families. Parents are increasingly moving children from government schools to private schools because they want better education. Public school enrolment is therefore being affected by parental choices as well as the number of children.

The regional patterns point to different responses. Southern school facilities could be repurposed for vocational training or elderly care. Northern states need to improve the quality of public education while managing continuing demand from a younger population.

Vocational training prepares people for particular kinds of work. Reusing school buildings for training or care would connect facilities left with fewer pupils to needs created by an older population and a changing labour market.

The Jobs Window Has a Deadline

India's population aged 15 to 59 is projected to peak at 1.01 billion in 2041. Making productive use of that workforce requires millions of new jobs each year, alongside education, health services and training.

High youth unemployment and a mismatch between workers' skills and employers' needs are already concerns. A large young population brings economic opportunity when people can find work and earn incomes. Without enough suitable jobs, many young adults can remain outside productive employment.

The World Economic Forum reports that only 20 percent of India's workforce is skilled, compared with an average of 80 percent in developed countries. The figures underline the scale of the training challenge accompanying the projected workforce peak.

Skill development and economic reforms to expand manufacturing that employs large numbers of workers are central to the response described in the demographic debate. Training and job creation need to progress together so that new workers have both the abilities employers require and opportunities to use them.

Muttreja's call for immediate investment in adolescent education, health and sexual health connects today's decisions with the workforce of the next two decades. Young people entering employment during that period will shape how much benefit India gains from its age structure.

The risk is that a demographic dividend becomes a demographic disaster, with a large population of unemployed young people contributing to social unrest. Northern states need jobs for their expanding workforce, while southern states need workers and services suited to an ageing population. A single national population figure cannot capture both sets of needs.

What to Know

• India's population is projected to reach approximately 1.59 billion by 2051, from a 2021 baseline given as 1.35 billion and also stated as 1.36 billion.
• Annual population growth is projected at about 0.5 percent nationally, compared with 1.1 percent in Bihar and 0.9 percent in Uttar Pradesh.
• The south's population share is projected to fall from 20 percent to 17 percent, while the northern and central share rises from 48.6 percent to 52.7 percent.
• Kerala reached replacement fertility in 1998; Bihar is expected to reach it in 2039.
• The delimitation debate centres on population, southern states' family planning achievements and the allocation of Lok Sabha seats.
• Workers from northern states are moving towards southern cities, while Gulf labour migration is also shifting northward.
• School enrolment fell by 13.4 million between 2018-19 and 2024-25, alongside the closure or merger of about 80,000 schools.
• India's population aged 15 to 59 is projected to peak at 1.01 billion in 2041, making employment and skills investment urgent.