[LouisVanDerWright]

Another thing to note is that this is a horribly general measure. Just the number of people between X and Y years is stupid. For example, Chicago's graphs shows the numbers more or less flat for years, but the question is which Millenials are we talking about?

In Chicago huge numbers of people are fleeing the South and West sides. That is a demographic trend entirely on its own and it includes a lot of "Millenials". If the topic of the discussion is "Millenials who were not born and raised in the city" I have a feeling the numbers for Chicago would show a steep incline for the last 10 years because huge numbers of Millenials who were born and raised here have moved out while huge numbers of wealthy, highly educated, Millenials have migrated in from the suburbs or outside of the metro.

I would be much more interested to see the numbers for Millenials who have moved into the city from outside of it and what percentage of them are sticking around after kids. Just a "people between 24 and 32" measuring stick tells us literally nothing in a society where you have so many sub cultures and splintered demographics.