OBJECTIVES: To determine the risk for birth and perinatal morbidity and mortality in the elderly mother pregnant. DESIGN: Retrospective clinical study of cross section. MATERIALS AND METHODS: Pregnant Women 35 years or older treated at the San Juan de Dios Hospital in Callao, between January 1990 and December 1991. birth outcomes and maternal and perinatal morbidity and mortality with the pregnant minor is compared 35 treated at the same time. RESULTS: Of 10 445 deliveries, 744 were for añosas pregnant women (7.7%). There were significantly more births añosas dystocic in pregnant women (19.2% vs 10.6%), including breech presentations (7.3%), transverse (0.9%) and other rare (0.6%), having served more vaginal breech births (6.1% vs 2%); the incidence of caesarean sections was 11%. The cesareada previous cesarean was the most common cause in both groups. The maternal mortality rate was 3...