First of all, you don't freaking need your own new house to start a family. In most countries most people never buy a new house.
Second, wealth is not zero-sum, there isn't a magic pot of gold redistributed between people. As value and demand are added to the economy, so is wealth because the new young people with demands can provide skills or time to be used in value creation and then they also (and older folks that are not creating value because they are not working) can consume and create demand which defines the amount of wealth they create. Poor old people are a net negative but rich old people create demand and thus wealth for value creating youth, unless of course they have everything they need and live in the woods or something. But even poor old people need to eat and have health care demands that young people provide.
The forest you are missing for the trees here is the greed of corporations who are not increasing wages to keep up with not just inflation but the value young people are creating. Things like labor unions are a joke in the US and politicians need corporations like fish need water. So the profit margins of companies and the wealth of shareholders is increasing as a result of the young people who are creating that wealth and giving it away to them because they can't collectively bargain and say they want fair pay. as individuals they can be replaced easily if they don't like the compensation.
So this whole old people vs young people and millenials destroying things and boomers hoarding wealth and all that is bullshit.
The education in the US is shit, you can't compete in a global economy and keep up with wealth creation as a result (still at the top but getting closer to stagnation). And the US is essentially and oligarchy at this point. The richest country in the world and it is the rich share holding class that only care about amassing enough wealth that their descendants will make it through whatever shit the country goes through, so they don't care how much americans suffer or get robbed in day light.
This comes down to democracy being a game of information. Whoever controls information controls democracy and this means two things, education and media. You have so many idiots even young ones fall for the trump bullshit because of education and media/social media bubbles and it isn't an accident that education is shit either, it isn't an accident that racism and xenophobia and other hateful things are the tools the ruling class uses to manange democracy.
America embraced greed as a way of life and the greedy rule and we are finding out why greed is evil in all forms as If we are part of a fable people will tell their children ages from now to teach them to avoid greed and pride.
But not all hope is lost, information and disinformation are education and self education are still popular thanks to the internet. Americans need to pursue truth and justice and fight evil because nothing built on lies and evil lasts.
Democracy can still work, but if the voters embrace greed, the the result is what you see. Ask most americans what they think of basic welfare and they'll tell you it's just black people being lazy and taking from the government (in reality it is mostly not black people but why does race matter at all?). We all know greed and hated are wrong, we can't blame corporations and politicians when we choose hatred and greed, these things must be adressed before you can change the way things are done and have fair wages and a stable democracy and solve so many other major issues in the US.
Forgive the long post, let me know if you disagree.