Many live at home until their late 20's because they cannot afford to move.
Im going to pick up on this one, because social history is facinating, so it's not a pop or dig.
The Post War generation 'never had it so good' and they did have it good, they didnt have to start married life in their mums spare bedroom and hope they would eventaully have enough to rent a place of their own, and if they did, they too would have to take in lodgers.
The post war generation, had contraception, they weren't banging out child after child who all lived in a two up two down, sleeping top to toe.
The Post War generation had free heath care, and innoculations. they werent dying of childhood diseases
The Post War generation had access to a much longer free education, up to 14, then 15 then 16 now 18, plus free uni
The Post War generation have lived in times of relative peace - I say relative because they might not be getting the Blitz every night but you still had the IRA going at it, and the spectre of the Cold War, Bay of Pigs, Cuban Missile Crisis etc
So every generation has had its hardships, and the Post War geration were a unique 60 odd year period in histroy that cannot be sustained unfortunately. This goes in cycles, and so children will stay at hom and multi generational houses will become normal again - how many loft conversions do you see? Loads, its quite noraml in my little area of the south east, a three generational house.
Lots of adverts in shop windows with rooms to rent - all very vogue again
Kids are pooling together to buy houses - like we did in the 80's - to get a foot on the housing ladder.
Demographically, kids are moving round, there are fewer local ties, with the amount of divorced and seperated parents- its often easier to move away with one parent and start afresh, it allows a minimum of two bases.
Uni education is falling back out of vogue with a return to traditional vocational pathways.