You forget that the empirical evidence is influenced by our cultural norms (such as children not leaving home until 18). If you (further) shelter/protect/struct

You forget that the empirical evidence is influenced by our cultural norms (such as children not leaving home until 18). If you (further) shelter/protect/structure young twenty-somethings, they'll grow up even slower, and fifty years hence a poster like you will be suggesting we raise the age of adulthood from 25 to 30. Perhaps we should help kids grow up faster by giving them more experiences and responsibilities.