Estonia’s men marry at a median age of 36 years and four months, the oldest of any country in an 83-country UN-based comparison covering 2015 to 2018. In Mozambique, women marry at a median age of 18.7, nearly two full decades earlier in life. Between those two extremes sits the entire global range of modern marriage timing, a range wide enough that the same word, “marriage,” describes a life event happening at meaningfully different ages depending on where a person is born.
What Does “Age of Marriage” Mean?
Demographers use several distinct measures of marriage timing, and reports frequently switch between them without flagging the difference. The mean age at first marriage is a simple average of the ages at which people in a given year or cohort married for the first time. The median age at first marriage is the age at which half of a cohort has married and half has not yet, a measure less sensitive to extreme outliers than the mean. The singulate mean age at marriage (SMAM) is a widely used demographic estimation technique that calculates average marriage age indirectly, from the proportion of people who remain single at each age in a census or survey, without needing direct marriage-date records. All three are legitimate but not interchangeable, and cross-country comparisons should specify which one is being used.
How Old Are People When They First Marry?
Global patterns split clearly along a development line, though with notable exceptions in both directions. UN data compiled in a Statista-hosted 2018 analysis of 83 countries with 2015-2018 data found the oldest grooms in Estonia at a median 36 years and 4 months, and the oldest brides in Slovenia at a median 34 years. Median marriage ages generally run higher in wealthier, more developed countries, a pattern consistent with delayed marriage trends documented globally.
Selected Median or Mean Marriage Ages by Country
| Country | Women | Men | Approx. Period |
|---|---|---|---|
| Estonia | n/a | 36.3 (highest recorded) | 2015-2018 |
| Slovenia | 34.0 (highest recorded) | n/a | 2015-2018 |
| South Korea | 31.5 | ~34.0 | 2015-2018 |
| Namibia | n/a | 34.3 | 2015-2018 |
| Sweden | 34.9 | 36.8 | 2023 |
| Mozambique | 18.7 (lowest recorded) | 23.4 | 2015-2018 |
| Ireland | smallest gender gap, ~1 year | smallest gender gap | 2015-2018 |
Sources: UN data via Statista global marriage ages analysis; Statistics Sweden, 2023.
Where People Marry Youngest and Latest
At the older end, Sweden’s national statistics office recorded an average age at first marriage of 34.9 for women and 36.8 for men in 2023, both rising over the preceding decade; women’s average age climbed 1.8 years over roughly ten years, more than the 0.7-to-1-year rise recorded for men over a similar span. South Korea posts the highest marriage ages recorded in Asia in the 2015-2018 comparison, at 31.5 for women and nearly 34 for men.
At the younger end, Mozambique recorded the lowest marriage ages among the countries in the 2015-2018 analysis, 18.7 for women and 23.4 for men, alongside some of the largest gender gaps in marriage age recorded anywhere: Senegal’s gap reached 7.8 years, Mali’s 7.1 years and Morocco’s 6.9 years. By contrast, Rwanda recorded one of the smallest gender gaps among African nations, at just 2.6 years, and Ireland recorded the smallest gap globally in the same analysis, with grooms only about one year older than brides on average.
How Marriage Age Has Changed
Marriage age has trended upward almost everywhere with sustained historical data, though from very different starting points. Sweden’s data show a clear, continuous rise: the average age at first marriage climbed from the early 2010s through 2020, dipped slightly in 2021, likely a pandemic effect, and resumed rising in 2022 and 2023.
Historical UN data on adolescent marriage tell the flip side of the same story: in a 2005 UN compilation, several African countries recorded 30 to 49 percent of women aged 15 to 19 as already ever-married, a figure that has fallen in most of these countries since, though not uniformly or completely.
Why People Are Marrying Later
Several forces combine to push marriage age upward in country after country as development proceeds:
- Education. More years spent in school and university mechanically delay the age at which most people are ready to marry.
- Employment. Establishing a career, particularly for women entering the workforce in greater numbers, competes directly with the years traditionally used for marriage and childbearing.
- Housing. The cost of establishing an independent household is frequently cited as a factor delaying marriage in higher-income countries with expensive housing markets.
- Economic security. Broader economic uncertainty, including unstable employment for young adults, is commonly associated with delayed marriage in developed-economy research.
- Changing social norms. Cohabitation before or instead of marriage has become widely accepted in much of Europe and parts of the Americas, reducing the social pressure to marry at a young age.
Marriage Age and the Timing of Parenthood
In societies where childbearing remains closely tied to marital status, marriage age functions as a rough proxy for the start of the reproductive window within a socially sanctioned union. OECD data document rising average ages at both first marriage and first childbirth across member countries in recent decades, a pattern consistent with delayed parenthood research showing average age at childbirth across OECD countries rising from 27 in 1980 to 30.9 in 2022.
The two trends are related but not identical: a country can see marriage age rise faster or slower than first-birth age, particularly where cohabitation before marriage, or childbearing outside marriage entirely, has become common.
Does Later Marriage Mean Fewer Children?
The relationship is real but not deterministic. Marrying later compresses the biologically available and, in many societies, socially sanctioned childbearing window, which contributes to lower period fertility rates in countries where marriage age has risen sharply. However, completed family size, the number of children a woman ultimately has over her lifetime, depends on many additional factors beyond marriage timing alone, including how quickly couples have children after marrying and whether they have children outside marriage at all.
Countries with very high marriage ages, such as Sweden, do not automatically have the world’s lowest fertility rates, since Nordic countries have historically combined late marriage with relatively strong social and family policy support that partially offsets the fertility effect of delayed partnership formation.
Frequently Asked Questions
1. What is the average age of marriage worldwide?
There is no single precise global figure because national data collection years and methods differ, but marriage ages in developed countries commonly fall in the late twenties to mid-thirties, while several lower-income countries record marriage ages under 20 for women.
2. Which countries marry the youngest?
Mozambique recorded the lowest marriage ages in a UN-based 2015-2018 comparison of 83 countries, at 18.7 for women and 23.4 for men, with several other countries in Sub-Saharan Africa and South Asia also recording marriage ages for women well under 20.
3. Which countries marry the latest?
Estonia recorded the oldest median marriage age for men in the same comparison, at 36 years and 4 months, while Slovenia recorded the oldest median age for women, at 34 years; Sweden’s 2023 national data show similarly late marriage, at 34.9 for women and 36.8 for men.
4. Does marrying later reduce fertility?
It can contribute to lower fertility by shortening the years available for childbearing within marriage, but the relationship is not absolute, since factors like family policy support, non-marital childbearing and how soon couples have children after marrying also shape completed family size.
5. What is the difference between mean, median and singulate mean age at marriage?
The mean is a simple average of ages at first marriage; the median is the age at which half a cohort has married; the singulate mean age at marriage (SMAM) is an indirect estimate calculated from the share of people still single at each age, useful when direct marriage records are unavailable.
6. Which countries have the biggest age gaps between brides and grooms?
Senegal recorded a 7.8-year average gap, Mali 7.1 years and Morocco 6.9 years in a UN-based comparison, among the largest recorded, generally associated with arranged marriage customs and economic factors like dowry payments.
7. Which countries have the smallest age gaps between brides and grooms?
Ireland recorded the smallest global gap in the comparison, with grooms only about one year older than brides on average, followed closely by Japan, at 1.3 years, and Rwanda among African nations, at 2.6 years.
8. Is child marriage still common anywhere?
Yes, though it has declined over recent decades. Niger has the highest recorded rate of girls married before 18, at over three-fourths in some estimates, followed by Chad and the Central African Republic, both around 61 percent in earlier UNICEF data.
9. Why is marriage age rising in most countries?
Rising education levels, greater female workforce participation, higher housing costs, economic uncertainty for young adults and growing acceptance of cohabitation before marriage have combined to push average marriage age upward across most of the world with reliable data.
10. Is age at first marriage the same as age at first childbirth?
No. The two are correlated in societies where childbearing is closely tied to marriage, but OECD data show average age at first childbirth has also risen independently, from 27 in 1980 to 30.9 in 2022 across member countries, and the two ages can diverge significantly where cohabitation or non-marital childbearing is common.
Sources
- United Nations data (2015-2018) as compiled and visualized by Statista, “When People Get Married Around the World”
- Statistics Sweden, Average age at first marriage by gender, 2013-2023
- United Nations Statistics Division, “The World’s Women,” Table 2a, Indicators on Marriage, 2005 edition
- UNdata, singulate mean age at marriage by country, various years
- UNICEF/Statista, countries with the highest child marriage rate, 2023 data
- OECD, Society at a Glance 2024, age at first childbirth and marriage trends
