You are much less likely to have kids:
According to the National Marriage Project, the incidence of childlessness is growing across the socioeconomic scale. In 2004, 20% of women over 40 remained childless. Thirty years ago that figure was 10%. But the problem--and it is a problem because the vast majority of women desire children--is much more extreme for career women. According to Sylvia Ann Hewlett, an economist and the author of Creating a Life: Professional Women and the Quest for Children, only 51% of ultra-achieving women (those earning more than $100,000 a year) have had children by age 40. Among comparable men, the figure was 81%. A third of less successful working women (earning either $55,000 or $65,000) were also childless at age 40. (Forbes)