A 304 woman is a term coined in the early 2000s to describe a woman who is single, over 30, and has no children. The term has been used in both positive and negative contexts, but it is generally seen as a neutral descriptor.
There are a number of factors that have contributed to the rise of the 304 woman. One is the increasing number of women who are pursuing higher education and careers. This has led to a delay in marriage and childbearing for many women. Another factor is the rising cost of living, which has made it more difficult for some women to afford to have children.