A friend of mine is a manager who recently went to a management seminar. It was the same old thing until they asked what peoples' biggest problems are. One person said "employees under 30," and everyone in the room agreed. They find this demographic to be needy and entitled (I'm sure this does not apply to everyone, but is a much bigger trend than in past years).
My department recently hired MANY new nurses, and all but one is under 30. They call in when they are hung over, go home early, and they're lazy at work. The only thing I can depend on them to do is get their coffee break. I'm sure these nurses have many fine qualities, and maybe the rest of us are just martyrs (put in the full 46ish hours a week, mop our own ORs, etc), but it's just a whole different attitude. People in other departments note a similar trend. Radiology techs will refuse to go to certain cases because it will interfere with their lunch.
I'm sure I will get a bunch of posts from 20-somethings about how hard they work, and I'm sure there are some out there who really do work their tails off. But managers (and coworkers) are starting to take note of "generation me."