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In France where I'm from, it's embarrassing, clearly it means that this person can't take care of himself, or is extremely childish, and we have quite a gloomy image of it. Also in France we have social helps, including for apartment, etc., so you have to fail quite hard or really not be able to live on your own... but it's changing, and here and there you heard about people moving back or not able to leave.

In Japan where I am, it's pretty common, it's even the norm for someone that should get married at some point (at 30, or even 35), time to save money and having it easy before taking care of a family. It can even be seen as the person taking care of his parents. There is still an exception, "the parasite single" that are seen as people using their parents for their own fun, no responsibility, lot of money, easy jobs, no involvement.