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Although the marriage process in Iran is based on being early and being prevailing in terms of age, after six censuses it has been noticed
that these two major characteristics have been decreased. In the 1375 census, approximately 50% of men and 40% of women were unmarried
despite the fact that they had the customary and legal age of marriage. The average age of marriage increases along with this decrease so that 2
and 2.6 years were added to the average age of marriage for men and women respectively after the Islamic Revolution in Iran. In the 1375
census, this new average age was 25.6 for men and 22.4 for women. Hence this increase in women's age of marriage can decrease the birth
rate and may help the government plan in its demographic policy as well. Although polygamy was noticed in the last census, it had a rapid reduction. Based on the statistical data, it may be deduced that the more educated the people are, the more the age of marriage is.