I'm only 30 so don't have much experience of the good old days, but I've read a lot of social history.
The prices of things are different, which makes the standard of living an average family can afford very different. For example, clothes are cheap so you can afford way more these days for the same money, but houses are expensive so buying in many areas is out of reach for people in their twenties. It's easy for older generations to look at what younger people have and criticise them for it, but it's possible to have a lot of tech (for example) for not much money.
That said, I think the availability of credit/debt is mad these days, and people use it for all sorts of stuff they really shouldn't. PayPal offered to let me pay for something in "X easy payments" the other day. It was a £5 kids sunhat on eBay! It's so easy to pay for things on credit, so easy to get more credit, and it's all totally anonymous. I don't have to slope down to the pawn shop to hand over my Sunday best suit to Dave in return for a few shillings and a disappointed tut. Click a few boxes and it's done.
So it becomes normal to buy everything on credit and pay it off later. Everyone's doing it, you don't even have to apply for a loan and prove its for something worthwhile. And then it escalates. People get involved in complex financial products and on the surface it seems fine but actually once they stop making repayments because they've lost their job or whatever it very quickly spirals out of control and they find out they're in big trouble. As long as they make the repayments everything's fine, but if the SHTF they're in a very precarious position.
People are used to thinking of credit cards as the same as debit cards, and therefore available credit the same as available money. Like the poster upthread who thinks house equity is the same as a rainy day fund. Except if the day is rainy, you might not have time to do all the paperwork before you need the cash, you might find banks aren't willing to lend you as much as you thought (because either you or they are by definition stretched)...
And when everyone has a student loan and a mortgage is everyone's goal, it just seems like any debt is normal. Also, our lives are very visible to others. We show them our homes and wardrobes every day, either in person or online - and see theirs too. Not just our immediate neighbours who we would expect to be in a similar financial situation, but people living on the other side of the country that we went to university with so they seem like our peers but they're living in Carlisle and were living in Camden - but we expect the same lifestyle.
I think it's the faceless ease of credit that is the biggest and scariest change. You don't have to look someone else in the eye and tell them what you want the money for. You just tick a box on an online checkout or fill in a two minute application online.