text: Among OECD countries, there is a general "one size fits all" model in regard to emerging adulthood, having all undergone the same demographic changes that resulted in this new stage of development between adolescence and young adulthood. However, the shape emerging adulthood takes can even vary between different OECD countries, and researchers have only recently begun exploring such cross-national differences. For instance, researchers have determined that Europe is the area where emerging adulthood lasts the longest, with high levels of government assistance and median marriage ages nearing 30, compared to the U.S. where the median marriage age is 27.
  Emerging adult communities in East Asia may be most dissimilar from their European and American counterparts, for while they share the benefits of affluent societies with strong education and welfare systems, they do not share as strong a sense of individualization. Historically and currently, East Asian cultures have emphasized collectivism more so than those in the West. For instance, while Asian emerging adults similarly engage in individualistic identity exploration and personal development, they do so within more restrictive boundaries set by familial obligation. For example, European and American emerging adults consistently list financial independence as a key marker of adulthood, while Asian emerging adults consistently list capable of supporting parents financially as a marker with equal weight. Some Asian emerging adults feel that getting married is a step only after school is finished and parents are cared for. Furthermore, while casual dating and premarital sex has become normative in the West, in Asia parents still discourage such practices, where they remain "rare and forbidden." In fact, about 75% of emerging adults in the U.S. and Europe report having had premarital sexual relations by the age of 20, whereas less than 20% in Japan and South Korea reported the same.