Even as there are reports outlining how young Americans could live their entire lives strapped with debt, there is a cohort of the younger generations, particularly Generations Y and X, who stand to inherit an unprecedented amount of wealth undefined somewhere in the neighborhood of $40 trillion.

http://www.washingtonpost.com/blogs/innovations/post/in-study-of-next-generation-donors-good-news-for-start-ups-social-entrepreneurs-and-innovators/2013/02/01/8c7ff32a-6c9e-11e2-ada0-5ca5fa7ebe79_blog.html