This is a list of countries by age at first marriage. The list is current from contemporary surveys. It does not treat the topic in history. Currency of information varies by country. Because the age distribution of people at first marriage is skewed with a longer tail towards older ages,[1] the majority of people marry before the average age of first marriage. The median age is a more precise representation of when the majority of people marry; for most reporting sources, however, only the average age at marriage is reported.
The age at first marriage is an index that indicates how old men and women are on their first marriage. The average age at first marriage is half the sum of the ages of both men and women at first marriage. Men and women living in Spain are the oldest at first marriage, followed by Japan, Chile, the Netherlands, South Korea, Argentina, Norway, Taiwan, Brazil and Hong Kong. In the United States, the mean age at first marriage is about 32 for men and about 30.8 for women, putting the average age at first marriage at about 31.4 for both genders. However, in India, it is even lower, at about 30 for men and about 27.2 for women, putting the average age at first marriage at about 28.6 for both genders.
| Country | Men | Women | Average | Age gap | Age ratio | Year | Source |
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| Country | Men | Women | Average | Age gap | Age ratio | Year | Source |
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| Country | Men | Women | Average | Age gap | Age ratio | Year | Source |
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| Country | Men | Women | Average | Age gap | Age ratio | Year | Source |
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Note: the reported age for these countries is the median, not the mean (average). All countries in italics have their data in the mean and not the median.
| Country | Men | Women | Median | Age gap | Age ratio | Year | Source |
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