The objective of the study was to analyse and compare demographic characteristics and clinical outcomes of pregnancies in adolescent, advanced age and normal reproductive age women. All completed pregnancies in a 6-month period, registered by the family practitioners in Denizli province, were included into the study. A face-to-face questionnaire was used to gather information. Participants were asked for demographic information, pregnancy outcome and obstetric history, obstetric and neonatal problems. Overall 5,882 pregnancies in different age groups: 296 (5%) adolescent (< 20-years-old); 4,957 (84.3%) normal reproductive age (20–35-years-old) and 629 (10.7%) advanced age (> 35-years-old ) (group III), were included into the study. Adolescent women had a lower educational status (p < 0.01), and family played a major role in decision of marriage (p < 0.01). Birth weight of the baby was lower in adolescents (p < 0.01). While adolescents tended to deliver vaginally (OR = 1.9, p < 0.01), elderly women were more prone to operative delivery (OR = 1.2, p < 0.05). Risk of caesarean section rate was higher in elderly nulliparous women (OR = 2.2, p 0.01). The number of spontaneous and induced abortions were increased with age (p < 0.01). Antenatal problems were seen least frequently in normal reproductive age women. Both antenatal (OR = 1.7, p < 0.01) and neonatal problems (OR = 1.5, p < 0.05), were significantly higher in advanced age pregnancy. It was concluded that with sufficient antenatal care, adolescent pregnancy is not associated with an increase in adverse pregnancy outcome, except low birth weights. Advanced maternal age is more likely to be associated with increased obstetric, maternal and neonatal complications.