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

55 years are reported by both, from 1968 to 2022.

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.

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

Ireland

30.95 years

in 2022

Japan

30.71 years

in 2023

Ireland rank

6th

Japan rank

7th

Average age of mothers at childbirth by birth order over time

Ireland
Japan

How they compare

Ireland currently reports 30.95 years against 30.71 years in Japan, a difference of 0.24 years.

The two have swapped places 4 times across 55 shared years of data; in 1968 it was Ireland ahead.

Ireland ranks 6th and Japan ranks 7th of 33 countries.

Across the 7 decades both report, Ireland averaged higher in 3 and Japan in 4.

Head to head by decade

Decade	Ireland	Japan	Difference	Ahead
1960s	26.3 years	25.87 years	0.435 years	Ireland
1970s	25.74 years	25.78 years	0.048 years	Japan
1980s	26.13 years	26.5 years	0.374 years	Japan
1990s	27.13 years	27.64 years	0.518 years	Japan
2000s	28.44 years	28.53 years	0.085 years	Japan
2010s	29.88 years	29.84 years	0.035 years	Ireland
2020s	30.96 years	30.46 years	0.5 years	Ireland

Averages of every year both report within each decade.

Frequently asked questions

Which has higher average age of mothers at childbirth by birth order, Ireland or Japan?: Ireland, at 30.95 years against 30.71 years in Japan as of 2022.
What is the difference in average age of mothers at childbirth by birth order between Ireland and Japan?: 0.24 years, with Ireland ahead.
How many years of comparable data are there for Ireland and Japan?: 55 years are reported by both, from 1968 to 2022.
How do Ireland and Japan rank globally for average age of mothers at childbirth by birth order?: Ireland ranks 6th 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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Ireland 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 03 September 2026, from https://population.statizoid.com/compare/period-average-age-of-mothers-birth-order/ireland/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.