Background : The age for maternal reproductiion has been bestimated to be between 15-49 years, but the ages between 20-35 years has been considered as the safest age group for bearing a child. This implies that pregnancy or childbirth below or above this age range can have unpleasant influences on either the mother, the pregnancy, delivery or the child. So, the goal of the present study was to assess pregnancy outcomes of nulliparous at different age groups, and to set guidelines for the nurses for the care of the nulliparous women in the different age groups. A descriptive research design was used, and the study was conducted at the labor ward of labor and childbearing hospital at zagazig university hospitals. The current work registered 195 women to compare the obstetric outcomes of mothers aged less than 20 years (teenage pregnancy, 65); mothers aged 35 years and more (older mothers, 65) with the mothers aged from 20 to 34 (adult group, 65). Personal demographic data summery of pregnancy and labor, and neonatal assessment sheet were used as the tools of this study. The results indicated that adolescent mothers have more threatened abortion, increased gestational age, and post term prolonged labor. And, gestational diabetes mellitus, pregnancy prompted hypertension, and caesarean section have had greater frequency among the older mothers. The total percentage of perineal tears in the third group was of the second degree type compared to 27.8% of the perineal tears in the first group and none in the second group. Post-partum hemorrhage insignificantly occurred with small percentages in the third and second groups compared to none in the first group (4.62%, 3.08% & 0.0% respectively). Lower APGAR score of the total study subjects in the 1st and 5th minutes was found in the first group. Also, neonatal death was found in the first group only, fetal anomalies were found in the third group more than the others. In conclusion, nulliparous advanced maternal age had more complications on the pregnancy outcomes than adolescents and adults. Antenatal counseling for avoiding pregnancy of labor complications especially for this extreme ages(overage-adolescent), has been recommended. [ABSTRACT FROM AUTHOR]