If that's the case then I'd assume that the "real" number would be significantly higher, given that Northern europeans leave their parental home at very young age, compared to most of the world.

I could only find updated statistics from the EU[0], so there's no data on Norway, but if memory serves me right, Norway has even lower age than Sweden.

[0] https://ec.europa.eu/eurostat/statistics-explained/index.php...