Maybe those parents (and others of their generation) should ask themselves why young people can't afford to move out? 

The economy has changed since the 1970s and 1980s. It benefits the few at the top. Home prices have skyrocketed (due to absurd levels of foreign wealth dumping), and wages have stayed relatively the same. The division of wealth is approach pre-War levels.

There is no magic too it. The Baby Boomers have greased themselves likes pigs for years (on the back of the greatest generation), cut taxes on the wealthy, and reduced social programs. And, they now have the gall to complain about young adults who cannot afford to move out?