B Background Death and morbidity of pregnant women, childbirth and childbirth are still a big problem for developing countries including Indonesia. In Indonesia the most common cause of maternal death in pregnancy is bleeding (28%), where the most frequent bleeding in young pregnancy is abortion. Several studies have shown a link between maternal age during pregnancy and the incidence of spontaneous abortion. To be able to understand the relationship between maternal age during pregnancy with spontaneous abortion, it is necessary to conduct research to determine the relationship between maternal age during pregnancy and the incidence of spontaneous abortion. The research method used an observational study with cross sectional approach with a sample of 240 people consisting of 120 people with spontaneous abortion and 120 people with normal parturition in Koja Hospital, North Jakarta. Data was collected by observing medical record data which included age, economic status and obstetric history (GPA). Data analysis using SPSS for Windows version 20.0 and the level of significance used is 0.05. The results of cross sectional analysis showed that there was a relationship between maternal age during pregnancy and the incidence of spontaneous abortion (0.037). Whereas for other variables did not show a significant relationship, only found an increased risk of spontaneous abortion events in the poor (0.241) and multigravida (0.096) groups. Conclusion It can be concluded that there is a significant relationship between maternal age at pregnancy and the incidence of spontaneous abortion and the increased risk of spontaneous abortion in patients whose economic status belongs to the poor group and multigravid patients. Maternal age at pregnancy that is not ideal (<20 years and> 35 years) is a factor that contributes to the incidence of spontaneous abortion.