I'm far from an expert, but aside from costs of living, the driving factor might just be younger people have been indoctrinated into a "school/college/work" pipeline. This path might discourage/postpone career exploration and hinder kids from figuring out what want to do. As such, young people stay with their parents as a sort of buffer while they formulate a more concrete life/occupational goal. Nothing wrong with younger generation; just the best coping strategy for a system that tries too hard to be one size fits all.
These are all very dramatic shifts in society. It may be be several decades before the full implications are worked out.
I'm far from an expert, but aside from costs of living, the driving factor might just be younger people have been indoctrinated into a "school/college/work" pipeline. This path might discourage/postpone career exploration and hinder kids from figuring out what want to do. As such, young people stay with their parents as a sort of buffer while they formulate a more concrete life/occupational goal. Nothing wrong with younger generation; just the best coping strategy for a system that tries too hard to be one size fits all.
I must know you, because I have had this very same discussion!