South Korea’s population is shrinking because far fewer babies are being born than people dying, driven by a combination of extreme housing costs, delayed marriage, intense career competition, and shifting attitudes toward family life. The country’s total fertility rate hit 0.75 in 2024, the lowest on earth, before ticking up slightly to 0.80 in 2025. With a current population of about 51.7 million, South Korea is projected to lose 13% of its people by 2050, dropping to roughly 45 million.
Fewer Births Than Deaths
South Korea crossed a critical demographic threshold when annual deaths began outnumbering births, tipping the country into what demographers call “natural population decline.” The population growth rate stood at negative 0.065% in 2023. That number sounds small, but it represents a structural shift: the country is no longer replacing the people it loses each year. Without a major reversal in birth rates or a significant increase in immigration, this gap will widen as the population ages and more people enter their final decades.
Housing Costs Are Squeezing Out Parenthood
Skyrocketing apartment prices, particularly in Seoul and other major cities, are one of the most direct forces suppressing births. Research from Princeton University found that rising house prices significantly reduce both the likelihood of homeownership and the probability of having children among renters. The effect is stark: in districts with the fastest price growth, very few renters are predicted to either buy a home or have a baby. Homeowners, interestingly, don’t show a corresponding boost in fertility from their increased wealth. Their decisions about children appear driven by other factors entirely.
This means housing policy isn’t just an economic issue in South Korea. It’s a population issue. When young couples can’t afford to buy or even rent adequate space, starting a family becomes something they postpone indefinitely or abandon altogether.
Marriage Is Declining Fast
In South Korea, nearly all births occur within marriage, so the collapse in marriage rates translates almost directly into fewer babies. Between 1993 and 2023, the share of women who ever married fell by 41%. For men, the drop was even steeper at 43%. The median age at first marriage has climbed to 31.2 for women and 33.8 for men, up from 25.2 and 28.3 respectively in 1993.
These aren’t small shifts. When people marry six years later on average, they compress their window for having children. A woman marrying at 31 has significantly less reproductive time than one marrying at 25, and second or third children become much less likely. The average age of first-time mothers had already reached 30.1 by 2010 and has continued climbing since, placing South Korea among the highest in the developed world.
Young People Can’t Afford to Plan a Family
The decision not to marry or have children isn’t simply a lifestyle preference for most young Koreans. It reflects a rational calculation about survival in one of the world’s most competitive societies. Young people feel they cannot spare the time, energy, or emotional bandwidth that parenthood demands because they are consumed by fierce academic competition, credential-building, and the struggle to land a stable job in a tight labor market.
South Korea has become a society where the traditional sequence of life milestones, securing a job, getting married, buying a home, having children, has broken down. Young people are too anxious about obtaining a secure income and a place to live to take on the financial and personal risk of raising a child. The cost of education alone is staggering, with private tutoring expenses that can rival mortgage payments. When you add childcare, housing, and the opportunity cost of a parent stepping away from work, the math simply doesn’t work for many families.
Women Face Career Penalties for Having Children
Gender dynamics play a significant role. South Korean women face a well-documented career interruption when they have children, and the wage gap between mothers and non-mothers is substantial. In a culture where professional identity and financial independence matter deeply, many women view childbearing as a threat to the career stability they’ve worked years to build. Government plans have been criticized for focusing on encouraging childbirth without addressing the structural reasons women choose not to have children, including unequal domestic labor expectations and workplace discrimination against mothers.
Infertility Is Rising Too
Even among those who want children, conceiving has become harder. The number of women and men diagnosed with infertility has risen in step with later marriages and older average parenting ages. IVF cycles in South Korea jumped 51.2% in just three years, from about 110,000 in 2019 to nearly 167,000 in 2022. Success rates hover around 30% for fresh embryo transfers and 42% for frozen ones, meaning many couples go through multiple expensive, physically demanding rounds before either succeeding or giving up.
This surge in fertility treatment reflects a painful irony: by the time many Korean couples are financially and professionally ready to have children, their biological window has narrowed considerably.
Rural Regions Face Extinction
The population crisis isn’t evenly distributed. South Korea’s Board of Audit and Inspection predicted that the number of areas classified as “high risk of extinction” will surge from 12 in 2017 to 157 by 2047. In the most extreme projection, by 2117 every local region in the country will face extinction risk except eight urban districts, including parts of Seoul’s Gangnam, Gwangjin, and Mapo, plus a handful of districts in Busan, Gwangju, Daejeon, and Gyeonggi Province.
The government designated 89 regions as having “decreasing populations” in 2021, using eight indicators including youth migration rates, aging rates, population density, and financial independence. In practice, this means that schools are closing, local businesses are shuttering, and municipal governments are losing the tax base needed to maintain basic services. Entire towns are aging out of existence while young people concentrate in a few metropolitan areas.
Government Spending Hasn’t Worked
South Korea has poured enormous resources into reversing the birth rate decline over multiple administrations. Cash bonuses for newborns, subsidized childcare, parental leave expansions, and housing support programs have all been tried. Despite these efforts, the fertility rate continued falling for years before its modest uptick in 2025.
Critics argue the government’s approach has been too focused on financial incentives without addressing deeper structural problems: the cost and intensity of education, the gender imbalance in caregiving, workplace cultures that punish parents, and a housing market that prices out young families. The most recent policy plans acknowledged this criticism and aimed to improve quality of life broadly rather than simply paying people to have babies. Whether that shift in philosophy produces results remains to be seen.
A Slight Rebound, but a Long Road
The fertility rate’s rise from 0.75 in 2024 to 0.80 in 2025 is a cautiously positive sign, and the pace of recovery actually exceeded the government’s most optimistic projections. Officials had forecast 0.75 for 2025, not expecting 0.80 until 2026. Under the best-case scenario, the rate would cross above 1.0 per woman by 2031.
Even that target, though, would still leave South Korea far below the 2.1 replacement rate needed for a population to sustain itself without immigration. A fertility rate of 1.0 means each generation is less than half the size of the one before it. The demographic momentum built up over two decades of ultra-low birth rates guarantees that South Korea’s population will continue declining for decades, even if fertility rates improve meaningfully from here.