The lifestyles of younger people involves a lot more eating out, coffee, mobile phones, fashion, cars and tech. It all adds up to a baseline level of spending that I never had when I was young.
Technotropic
I'm not sure how old you are or what you did when you were young, but suppose you ware a secretary in 1978, and your boss told you you don't need a freakin' typewriter, because… well, in "his days", he just wrote by hand.
The problem is that "mobile phones and tech" are VERY important these days. My personal laptop allows me to work for my employer as and when needed. Last year, my employer also cancelled all Blackberries worldwide, because they think BBs no longer perform the function needed, and required EVERY employee to use their own personal smartphone until they find a solution (likely to be iPhone).
If you stop young people to engage with technology, you are likely going to be taking away the ONE THING that could make them competitive. Look around you. Which industries are there where "oldies" cannot compete with the youngsters? Tech. Google, Facebook… median working age is something in the 20s. And no, Google does not just do the search engine we all know about, but a lot of other things. It's actually transforming the world somewhat.
DH and I are in our 30s. We have VERY good jobs that pay really well compared to most people in the UK (combined income is higher than 95% of UK households apparently). Isn't it weird that our income is higher than 95% of the population, and yet, we can't afford to buy a house without parental help... yet baby boomers who had jobs that never paid as well could?
Re. cars - you are generalizing there once again. The most expensive car we ever bought was our current one for £2,250 second hand. It's a decent car, because it used to be a company car - so it was well kept and not much used. We hope in a few years, after buying a house, we can actually treat ourselves to a posher car, but it will still be second hand. We don't see the point of paying megabucks for a new car that will see its value deteriorate by half over four years or so.
Fashion - if I did not have nice clothes at work, no one would take me seriously. There is an unwritten understanding that if they pay you well, you need to also be very presentable, and this often comes at a price (polyester suits are very easy to identify). It's almost like the image of the firm rests on your shoulders or something. Again, this might be difficult to understand for those people who have not worked in the same environment, and it annoys me a lot when a lot of older women who had a job but not a career smirk when they don't get what I mean.
DH and I did once discuss the conundrum of seeing a lot of premium or new cars in not so nice neighborhoods. In a way, we came to the conclusion that if you really can't see the light at the end of a tunnel… if you can't see yourself ever moving from the area because you can't afford to… you may spend your money on a car instead. The nice new car is a reachable dream. For many, home ownership is not.