If you're resisting the urge to have a Brangelina-sized brood anytime soon (or maybe ever) you have some company. The number of women ages 40 to 44 who don't have children has doubled in the last generation, according to a new report from the U.S. Census. As of June 2006, 20% of women in that age group were childless, up from 10% thirty years ago. And the study finds that even women who do decide to start families are having fewer children. The birthrate among the white and Asian populations have declined to the point that they will not replace themselves, but the Hispanic population is growing. The report gives no reason for the changing rates, but analysts point to delayed marriage and more women choosing careers over having children. [USA Today]