Background: According to the World Health Organization (WHO), the number of premature births in the world increases to 15 million premature births each year. Indonesia is the fifth largest contributor to the number of premature births in the world with around 675,700 births in 2018. This is due to several factors, one of which is the age of the mother during pregnancy. The young age of the mother (< 20 years old) has the potential to be unprepared for the body to accept pregnancy. Likewise, maternal age (> 35 years old) whose reproductive function has begun to decline has the potential to be a factor in premature birth. Methods: This study uses observational analytic with a cross sectional approach. The total sample obtained was 77 postpartum mothers who were taken by accidental sampling. Result: It was found that there were 3 mothers (3.9%) with young age (<20 years old), 54 mothers (70.1%) with average age (20-35 years old), and 20 mothers (26%) with elder age (>35 years old). With the incidence of prematurity in young mothers as many as 2 cases (66.7%), moderate age as many as 23 cases (42.6%), and elder age as many as 12 cases (60%). Conclusion: Premature events often occur at the age of young mothers, namely <20 years old and elder age> 35 years old.