To follow up with this... they have a stupid video on their page where they break down expenditure of a girl in Houston who makes 65k. Insurance and rent takes half. Food is minimal at $271
It has been a long time since people only lived at home because they didn't have real jobs or are in school. Many are also likely to need cars so they can get to work (because most places in America you need a car), there is a decent chance they are paying for some amount of healthcare out of pocket as well. Rent is unaffordable as hell.