Don't Trust Anyone Under 30
"In 2008 author Ron Alsop called Millennials 'Trophy Kids,' a term that reflects the trend in competitive sports, as well as many other aspects of life, where mere participation is frequently enough for a reward. It has been reported that this is an issue in corporate environments. Some employers are concerned that Millennials have too great expectations from the workplace. Studies predict that Generation Y will switch jobs frequently, holding many more jobs than Generation X due to their great expectations."
That's the Wikipedia description; here's the handy video employee training guide: