Who are "the millennials" and why should you as a marketer or manager care? With over 76M members of the Gen Y population, they cannot be ignored. Did you know it costs $24,000 to replace each millennial hire that leaves, and 91% expect to stay in a job for less than 3 years? Or that by 2014, Gen Y will have over $1.4 trillion in spending power? Lets check out the below infographic which explains what marketers and managers need to know today.