„Primary education (ISCED 1) starts at the age of 6 in most OECD and partner countries, although the typical entry age ranges from 5 in countries such as Australia, Ireland, New Zealand and the United Kingdom to 7 in Bulgaria, Croatia, Estonia, Finland, Latvia, Lithuania, Poland and Sweden.“
OECD (Hrsg.), Education at a Glance 2026. OECD Indicators (2026), S. 206.