The thing is it's not comparable circumstances really. Rents being high is a significant issue, before it was feasible to rent and save at the same time, whereas now, rent is more than a mortgage and therefore it's much harder to knuckle down and save.
Also, this generation want it all. And that costs. Mobile phones and internet use are now necessity, almost everyone has some sort of entertainment pack, either via sky type services or steaming services. Car ownership or/and public transport as huge costs now. Compared to previous costs, people didn't have direct debits, or very few, they didn't have debts, they didn't have all these extra costs, they lived really what we would describe as frugal. People going away abroad was much less rare.
Now people want all of that and a house ownership and it's getting more and more difficult. Most 20 year olds I know upgrade their phone every year or 2, as soon as the contract runs out they rush out to upgrade, often at additional cost, they drive around in newer cars. My phone is up for renewal and I went in to consider my opinions, I was being pressured into upgrading but wasn't sure, I said I would rather buy the phone and he thought that was stupid, why would I do that, he said no one owns cars anymore, he said that it's stupid it but a car, you should just upgrade every 3 years with those ballon payment things.
I think it's just different mentality and different ideas. My parents have almost always had older cars that they own outright, they would nerve consider leasing a car.
Being somewhere in the middle, we do a little of both, but I just think life is different now, we expect our lifestyles to be different. The invention of social media forces many to portray a certain lifestyle where before just a quiet weekend in was fine. Now, I feel guilty if I don't take the kids out because social media shows that everyone is doing all these wonderful things with their kids. There was none of that social pressure before, least not anything like it is now.