The impediment of age, both in Polish legislation and in canon law, is a circumstance that renders a person unqualified to contract marriage. The author examined the premises for the existence of the abovementioned impediment in the Polish and canonical legal orders. The procedure of granting a permit and a dispensation from an impediment of age also has been analyzed. An obtaining a permit in the Polish legal order, as well as dispensations in canon law, allows those affected by the impediment to enter into a marriage. Analyzing the issue of granting dispensation in ecclesiastical legislation, the author considered this procedure both in the ordinary case as well as whenever an impediment is discovered after everything has already been prepared for the wedding and in the case of danger of death.