The Special Marriage Act, 1954
4. Conditions relating to solemnization of special marriages. –
Notwithstanding anything contained in any other law for the time being in force relating to the solemnization of marriages, a marriage between any two persons may be solemnized under this Act, if at the time of the marriage the following conditions are fulfilled, namely:-
(a) neither party has a spouse living;
(b) neither party is an idiot or a lunatic;
(c) the male has completed the age of twenty-one years and the female the age of eighteen years;
(d) the parties are not within the degrees of prohibited relationship; and
(e) where the marriage is solemnized outside the territories to which this Act extends, both parties are citizens of India domiciled in the said territories.