Out of curiosity, I graphed the childless ratio for all ages based on their data: https://mod.ifies.com/f/210831_childless_ratio_by_age.png https://mod.ifies.co

Out of curiosity, I graphed the childless ratio for all ages based on their data: https://mod.ifies.com/f/210831_childless_ratio_by_age.png https://mod.ifies.com/f/210831_childless_ratio_by_age.png Eyeballing, it looks like 55-64 is more childless than 40-54, but I haven't done any deeper analysis to be able to project how the curve might change in the future. Data from here: https://www.census.gov/programs-surveys/sipp/data/datasets/2018-data/2018.html https://www.census.gov/programs-surveys/sipp/data/datasets/2... Graph is made with their example pandas pandas code with the TCEB (total children ever born/fathered) column added, then: (df[df['TCEB']==0].groupby('TAGE').size().div(df.groupby('TAGE').size())).plot(); plt.show()