Either they’re truly “necessities” – which means they can’t be put off purchasing for seven-plus years due the greed of their parents – or they’re not – which means people find a way to live without them. I’ll give this Boomer credit for being generationally consistent in wanting to have things both ways.
In regard to housing, my theory is the only reason that Boomer NIMBYs in California have suddenly relented on auxiliary dwelling units is that they finally collectively realised “holy crap, we priced our own age 30+ kids out of the housing market and they’re about to move out of state just when I need them to stay nearby.”