In America the credit card companies have very clever yet misleading commercials on TV. They have a big influence on our youth. Sadly they will do nearly anything, like offering cash back or zero interest to get people to use their cards. The amount of consumer credit card debt in the US, is at an all time high. It's very sad. Before many young people reach age 25, they are in over their head in debt. Usually with no way to pay it off. It's a widespread problem.
As far as buying a house or car, I've always paid cash. No credit is required since you're paying the full amount on the spot. The amount of interest I've saved is simply unbelievable.
It took until I was 30 yrs old to save the money for my house, but I feel it was well worth it. Patience and determination serve one very well.
Either a ridiculously high salaried job or a cruddy house. Either way, not the typical consumer. Most would be lucky to have barely paid off their college debt before 30.
Personally, I'll only be 3 years out of grad school by 30. No possible way that amount of money could be saved in 3 years, even with a PhD from a good university.