It's not about high school or college. It's about after. Most millennials will never, ever be able to buy a house. The median home price right now in the USA is approximately $400,000. In some areas like San Fran, it's $1.3 million. They have increase exponentially faster than wages have.
Wages have stagnated, inflation is increasing significantly faster than wages. It's impossible to even save up because of low wages, high cost of college + interest on student loans, extremely high rent prices, the high cost of cars and insurance, high cost of medical care, food prices are insane.
There are VERY VERY few houses being built in America. It's mostly apartments being built. So home prices will continue to skyrocket due to high demand but low supply, and most people will be forced to be permanent renters.
Not only can they not afford to buy houses, they can't even afford to have children.
The retirement age is going to be changed to 70+ in the very near future, but most still won't be able to retire by then. SOCIAL SECURITY WILL NOT EXIST by the time 30 year olds (in 2025) retire, meaning all they paid into the program will just vanish.