What is the difference in lower secondary school starting age between Democratic Republic of the Congo and Iran?

0 years, with Democratic Republic of the Congo ahead.

How many years of comparable data are there for Democratic Republic of the Congo and Iran?

56 years are reported by both, from 1970 to 2025.

Where does this data come from?

Data API, UN Educational, Scientific and Cultural Organization (UNESCO), published as Lower secondary school starting age (years). Statizoid refreshes it automatically from the source and publishes the full history for both places.

Democratic Republic of the Congo vs Iran: Lower secondary school starting age

Democratic Republic of the Congo

12 years

in 2025

Iran

12 years

in 2025

Democratic Republic of the Congo rank

30th

Iran rank

30th

Lower secondary school starting age over time

Democratic Republic of the Congo
Iran

How they compare

Democratic Republic of the Congo currently reports 12 years against 12 years in Iran, a difference of 0 years.

The two have swapped places 2 times across 56 shared years of data; in 1970 it was Iran ahead.

Democratic Republic of the Congo ranks 30th and Iran ranks 30th of 209 countries.

Democratic Republic of the Congo has averaged higher in every one of the 6 decades both report.

Head to head by decade

Decade	Democratic Republic of the Congo	Iran	Difference	Ahead
1970s	12 years	11.2 years	0.8 years	Democratic Republic of the Congo
1980s	12 years	11 years	1 years	Democratic Republic of the Congo
1990s	12 years	11 years	1 years	Democratic Republic of the Congo
2000s	12 years	11 years	1 years	Democratic Republic of the Congo
2010s	12 years	11.7 years	0.3 years	Democratic Republic of the Congo
2020s	12 years	12 years	0 years	—

Averages of every year both report within each decade.

Frequently asked questions

Which has higher lower secondary school starting age, Democratic Republic of the Congo or Iran?: Democratic Republic of the Congo, at 12 years against 12 years in Iran as of 2025.
What is the difference in lower secondary school starting age between Democratic Republic of the Congo and Iran?: 0 years, with Democratic Republic of the Congo ahead.
How many years of comparable data are there for Democratic Republic of the Congo and Iran?: 56 years are reported by both, from 1970 to 2025.
How do Democratic Republic of the Congo and Iran rank globally for lower secondary school starting age?: Democratic Republic of the Congo ranks 30th and Iran ranks 30th of 209 countries.
Where does this data come from?: Data API, UN Educational, Scientific and Cultural Organization (UNESCO), published as Lower secondary school starting age (years). Statizoid refreshes it automatically from the source and publishes the full history for both places.

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Democratic Republic of the Congo vs Iran: Lower secondary school starting age. Statizoid, drawing on Data API, UN Educational, Scientific and Cultural Organization (UNESCO). Retrieved 17 August 2026, from https://education.statizoid.com/compare/lower-secondary-school-starting-age-years/congo-dem-rep/iran-islamic-rep/

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<a href="https://education.statizoid.com/compare/lower-secondary-school-starting-age-years/congo-dem-rep/iran-islamic-rep/">Democratic Republic of the Congo vs Iran: Lower secondary school starting age</a> — Statizoid

About this data

Indicator: Lower secondary school starting age (years)
Unit: years
Source: Data API, UN Educational, Scientific and Cultural Organization (UNESCO)
Licence: CC BY 4.0 (World Bank Open Data)
Coverage: 209 places, 11,411 data points, 1970–2025
Last refreshed: 06 August 2026

Lower secondary school starting age is the age at which students would enter lower secondary education, assuming they had started at the official entrance age for the lowest level of education, had studied full-time throughout and had progressed through the system without repeating or skipping a grade.