Primary school in the Netherlands lasts 8 years, typically from age 4 to 12. The first 2 years used to be to be separate and non-mandatory until the 1980s, when they were merged into a single 8 year track. Homework typically doesn't start until the 5th or 6th year, so when the kids are age 9 or 10. They certainly don't get any homework before they're 8 years old.