As far as I can tell that whole report is predicated on birth rates. I'm sure they are a lot smarter than I am but...
The population growth of 32.7 million people between 1990 and 2000 represents the largest census-to-census increase in American history.2 The previous record increase was 28.0 million people between 1950 and 1960, a gain fueled primarily by the post-World War II baby boom (1946 to 1964).
Are all those new people Baby Boomers? I realize that this part of the budget is out of control. But I question their assumptions in light of this most recent census.