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Why Finland Starts School at Seven — What PISA-Era Research Reveals About School Entry Age

By Leon MoriguchiPublished May 15, 2026Updated May 18, 20265 min read日本語版あり
Audience
Parents curious about school starting age and preschool education; parents who want a cross-national perspective on education

TL;DR

  • ·PISA: the Programme for International Student Assessment — an OECD survey that compares the academic skills of 15-year-olds across countries every three years 2022 scores for Finland (seven-year entry) and the UK (five-year entry) converge near-identically at age 15 — there is no consistent cross-national pattern between school starting age and eventual academic achievement
  • ·The relative age effect: the academic and developmental advantage that children born early in a school cohort tend to hold over those born near the cutoff date — most visible in the early grades (April-born children outperforming March-born in Japan's cohort system) is real; in large-scale Florida data it persisted at roughly 0.2 standard deviations on test scores from age 6 to 18 — but it is a group average, far smaller than the differences between individual children born in the same month
  • ·Heckman's early investment argument is about environment quality — play-rich, dialogue-rich, high adult engagement — not about early formal academic instruction; the research supports investing early, not drilling early

Contents

  1. Lead
  2. What "school at seven" in Finland actually means
  3. What the PISA data show
  4. Relative age effect — the influence of birth month within a cohort
  5. Heckman's early investment argument and how it fits
  6. Japan's six-year entry: context
  7. Summary
  8. References

Lead

Children in Finland start primary school at seven. Japan, Germany, and most U.S. states start at six; the United Kingdom starts at five. Whether these differences in school entry age affect academic outcomes a decade later has been a recurring question in education research since PISA data became available.

"Earlier is better" has intuitive appeal. The data do not simply support that intuition.

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