Psychology researcher Jean Twenge knew that scientific studies are often oversimplified and misinterpreted in the media, so she decided to look into the studies that caused her own early-30s baby panic. She found that the oft-cited American Society for Reproductive Medicine statistic  that one in three women 35 to 39 will not be able to get pregnant after a year is based on birth records more than 150 years old. Studies using more recent data find that the fertility rate of women in their late 20s/early 30s is only slightly higher than women in their late 30s. One study published in Fertility and Sterility found that 78 percent of 35-to-40-year-olds having sex during fertile times got pregnant within a year, compared with 84 percent of 20-to-34-year-olds. In other words, the idea that 35 is the cut-off for having kids without reproductive health might be total BS.