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

Audience: Parents curious about school starting age and preschool education; parents who want a cross-national perspective on education
Target length: ~1,300 words
Status: Draft v1 (translated from Japanese v1)
Original: ../299_finland_education_comparison.md

TL;DR

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 (April-born children outperforming March-born in Japan's cohort system) is real at school entry but largely disappears by age 15–16 and is not a reliable long-term predictor of outcomes
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

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.

Lead

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