How many years of comparable data are there for Denmark and Japan?

56 years are reported by both, from 1968 to 2023.

Where does this data come from?

Human Fertility Database (2025) – processed by Our World in Data, published as Average age of mothers at childbirth by birth order. Statizoid refreshes it automatically from the source and publishes the full history for both places.

Denmark vs Japan: Average age of mothers at childbirth by birth order

Denmark

30.34 years

in 2024

Japan

30.71 years

in 2023

Denmark rank

8th

Japan rank

7th

Average age of mothers at childbirth by birth order over time

Denmark
Japan

How they compare

Japan currently reports 30.71 years against 30.34 years in Denmark, a difference of 0.37 years.

Across all 56 years both countries report, Japan has been ahead every year.

Denmark ranks 8th and Japan ranks 7th of 33 countries.

Japan has averaged higher in every one of the 7 decades both report.

Head to head by decade

Decade	Denmark	Japan	Difference	Ahead
1960s	23.51 years	25.87 years	2.36 years	Japan
1970s	24.07 years	25.78 years	1.71 years	Japan
1980s	25.46 years	26.5 years	1.04 years	Japan
1990s	27.05 years	27.64 years	0.598 years	Japan
2000s	28.21 years	28.53 years	0.315 years	Japan
2010s	29.15 years	29.84 years	0.695 years	Japan
2020s	29.99 years	30.52 years	0.525 years	Japan

Averages of every year both report within each decade.

Frequently asked questions

Which has higher average age of mothers at childbirth by birth order, Denmark or Japan?: Japan, at 30.71 years against 30.34 years in Denmark as of 2023.
What is the difference in average age of mothers at childbirth by birth order between Denmark and Japan?: 0.37 years, with Japan ahead.
How many years of comparable data are there for Denmark and Japan?: 56 years are reported by both, from 1968 to 2023.
How do Denmark and Japan rank globally for average age of mothers at childbirth by birth order?: Denmark ranks 8th and Japan ranks 7th of 33 countries.
Where does this data come from?: Human Fertility Database (2025) – processed by Our World in Data, published as Average age of mothers at childbirth by birth order. Statizoid refreshes it automatically from the source and publishes the full history for both places.

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Denmark vs Japan: Average age of mothers at childbirth by birth order. Statizoid, drawing on Human Fertility Database (2025) – processed by Our World in Data. Retrieved 30 August 2026, from https://population.statizoid.com/compare/period-average-age-of-mothers-birth-order/denmark/japan/

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About this data

Indicator: Average age of mothers at childbirth by birth order
Unit: years
Source: Human Fertility Database (2025) – processed by Our World in Data
Licence: CC BY 4.0 (Our World in Data)
Coverage: 33 places, 1,628 data points, 1933–2024
Last refreshed: 28 August 2026

Average age of mothers when they have their first child in a specific year. It is standardized for the age structure of the female population of reproductive age.