It's out of reach unless you're a member of the ruling class.
This mindset is exactly the problem. It's false. It's just that you can't have your big house and RV and trailer and boat and luxury vacations all by age 30 if you get married and have kids.
The author mentions it took his parents 20 years after marriage to afford a house. And a 50's starter house would have been around 1000 square feet, which the modern generation turns up their nose at.
We have more efficient food and housing and clothing than ever before. People can afford marriage and children. They just don't prioritize it.
They don’t build new 1000 sq ft houses. Rent is as high as a mortgage. Kids are a luxury.