This is what I mean by the demographic snake

This column by Alexandra Petri is a perfect illustration of the concept I am trying to express that the demographic snake has implications for so many aspects of society precisely because there is such a generational disconnect, and the shift will occur dramatically.
http://www.washingtonpost.com/blogs/compost/post/generation-unscrewed/2012/07/17/gJQAtuT4rW_blog.html