In 2024, the average age at which South Korean women married for the first time was 31.55 years, while for men, it was 33.86 years. The average age of both men and women marrying for the first time in South Korea has steadily increased in recent years. Shifting attitudes towards marriage The number of marriages in South Korea has been consistently declining. While the overall decrease in population may play a role, the most significant factor is the societal shift in the perception of marriage. According to a survey, nearly half of South Koreans consider marriage an option rather than a necessity. Some of the main reasons South Koreans choose to remain unmarried include concerns about raising children, high wedding expenses, and worries about their careers. Demographic implications As more South Koreans choose to marry later in life or not at all, this trend significantly impacts the country's demographic landscape. The declining birth rate and increasing life expectancy present challenges for the country's future, particularly regarding economic productivity and growth.

In 1900, the fertility rate in the region of present-day South Korea was six children per woman, meaning that the average woman born in South Korea in that year could expect to have six children over the course of their reproductive years. This number began to fluctuate in the 1930s, when the Japanese administration (the Korean peninsula had been annexed by Japan in 1910) promoted fertility as part of the war effort, before fertility dropped below 5.2 births per woman in the aftermath of the war. It then increased above 6.3 in the 1950s due to the devastation and mass-displacement caused by the Korean War. As stability returned to the region, South Korea's fertility rate would fall sharply throughout the remainder of the century, as modernization, urbanization, and the implementation of family planning programs would see fertility fall to just over 1.5 children per woman by 1990.

Sex-selective abortion and gender ratios Abortion was illegal in South Korea between 1953 and 2020, although it was permitted in some cases from 1973 onward. Despite this, these laws were rarely enforced, and sex-selective abortion became widespread following advancements in ultrasound technology. In many Asian societies, it was often preferred to have male children as they were viewed as being better long-term providers for their parents and they would carry on the family name. In South Korea in the early 1990s, the practice of sex-selective abortion became so widespread that the gender ratio at birth was 114 males for every 100 females (reportedly as high as 125 in some cities), compared to the historical and natural average of approximately 105 males per 100 females. The government then prohibited doctors from revealing the gender of unborn babies to the parents in 1987, and introduced more severe penalties in 1994, in an attempt to revert this trend. The gender imbalance then reduced in the following decades, and has been at 106 males per 100 females since the 2010s (roughly the natural average). Abortion rights in South Korea were expanded in 2021.

Lowest in the world? Despite government initiatives aimed at increasing fertility, including financial incentives, South Korea's fertility rate has continued to fall in recent years, and today is at around half of replacement level. In 2020, it is estimated that the average woman born in South Korea will have just over one child over the course of their reproductive years. Some critics cite economic factors, such as high education and housing costs, for the reason that young couples are postponing marriage and having families; today, South Korea has the lowest adolescent fertility rate, and the lowest overall fertility rate in the Asia Pacific region. Due to the current trajectory of South Korea's fertility rate, in January 2021, it was announced that the South Korean population experienced a natural decline for the first time in it's history.

In 2024, the number of births in South Korea stood at *******, a slight increase compared to the previous year. Around two decades earlier, this number was twice as high. Declining fertility in South Korea A phenomenon that most East Asian countries and territories grapple with is a stark decline in fertility rates. This is especially evident in South Korea, which has the lowest fertility rate in the world, far below the 2.1 children per woman threshold that represents replacement fertility. In response to the expected economic consequences of a declining population, South Korea has implemented various initiatives to encourage married couples to have children. Factors contributing to low birth rates in South Korea One major element is the societal change in attitudes toward childbirth. In a survey, half of the South Korean respondents asserted that marriages can be happy without children, and a sizable share also stated that having children was dependent on economic factors. In addition, an increasing number of South Koreans are choosing not to get married. In 2023, South Korea recorded one of the lowest numbers of marriages in its history. Furthermore, there has been a growing trend among South Korean women to prioritize their financial independence and career continuity over traditional expectations of childbearing.

With an average of *** births per woman, Afghanistan had the highest fertility rate throughout the Asia-Pacific region in 2024. Pakistan and Papua New Guinea followed with the second and third-highest fertility rates, respectively. In contrast, South Korea and Hong Kong had the lowest fertility rates across the region. Contraception usage Fertility rates among women in the Asia-Pacific region have fallen throughout recent years. A likely reason is an increase in contraception use. However, contraception usage varies greatly throughout the Asia-Pacific region. Although contraception prevalence is set to increase across South Asia by 2030, women in both East Asia and Southeast Asia had higher contraception usage compared to South Asia in 2019. Women in APAC With the rise of feminism and the advancement of human rights, attitudes towards the role of women have changed in the Asia-Pacific region. Achieving gender equality has become a vital necessity for both men and women throughout the region. Alongside changes in traditional gender roles, women in certain Asia-Pacific countries, such as New Zealand, have become more inclined to marry later in life. Furthermore, the focus for younger women appears to be with having stability in their lives and securing an enjoyable job. This was displayed when female high school students in Japan were questioned about their future life aspirations.