We have compared selected complications during the pregnancy according to the age of mothers and with an extra view to women older than 35 years of age. We have tried to confirm the fact of higher riskiness of their pregnancies in the Brno ELSPAC set. In our study there were 5531 women with all data concerning their pregnancies. We have found higher number of complications in older women`s pregnancies, however the most important risk factor was hypertension, which seems to be also the basic starter for other health problems.