There is no social stigma and there is no "powers" telling anyone who to date. There is no attempt by "society" to push anyone anywhere. Everyone I know date and marry whoever they want. Unless you live in a very traditional religious culture that prohibits dating certain groups or marry certain people etc I have never seen anyone following any dating or marrying rules whatsoever. I lived in both Europe and US and mingle with variety of cultures and people of all ages. What you describe doesn't exist

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