* Age.[6] If the man is under 16 years of age, or the woman is under 14 years of age, then their marriage is invalid. This is an ecclesiastical impediment, and so does not apply to a marriage between two non-Catholics. However, note that in a marriage between a Catholic and a non-Catholic, the age limitation applies to the non-Catholic party as well.[7] Each national episcopal conference has the authority to set a higher minimum age as a prohibitive impediment. Note that, in general, individual bishops do not have this authority (cf. CIC c. 1075 §2).[8] (...) In England and Wales, this minimum age has been set to be in accordance with civil law (...) In South Africa, and also in Switzerland, this minimum age has been set to be in accordance with civil law.[13] (...) The United States Conference of Catholic Bishops has not enacted a higher prohibitive minimum age for marriage.[15]
*** Physical capacity for consummation lacking [16]. While a couple need not be fertile, both parties must be physically capable of completed vaginal intercourse, wherein the man ejaculates "true semen" into the woman's vagina. (See [1] for details.) To invalidate a marriage, the impotence must be perpetual (i.e., incurable) and antecedent to the marriage. The impotence can either be absolute or relative. This impediment is generally considered to derive from divine natural law, and so cannot be dispensed.[17] The reason behind this impediment is explained in the Summa Theologica:[18] “In marriage there is a contract whereby one is bound to pay the other the marital debt: wherefore just as in other contracts, the bond is unfitting if a person bind himself to what he cannot give or do, so the marriage contract is unfitting, if it be made by one who cannot pay the marital debt.”**
* Previous marriage [19]. Previous marriages, whether conducted in the Catholic Church, in another church, or by the State. All previous attempts at marriage by both parties wishing to marry must be declared null prior to a wedding in the Catholic Church, without regard to the religion of the party previously married. Divine, absolute, temporary.
* Disparity of cult [20]. A marriage between a Catholic and a non-baptized person is invalid, unless this impediment is dispensed by the local ordinary. Ecclesiastical, relative.
* Sacred orders [21]. One of the parties has received sacred orders. Ecclesiastical, absolute, permanent (unless dispensed by the Apostolic See).
* Perpetual vow of chastity [22]. One of the parties has made a public perpetual vow of chastity. Ecclesiastical, absolute, permanent (unless dispensed by the Apostolic See).
* Abduction [23]. One of the parties, usually the woman, has been abducted with the view of contracting marriage. Ecclesiastical, temporary.
* Crimen [24]. One or both of the parties have brought about the death of a spouse with the view of entering marriage with each other. Ecclesiastical, relative, permanent (unless dispensed by the Apostolic See).
* Consanguinity [25]. The parties are closely related by blood. Ecclesiastical or divine, depending on the degree of relationship. Relative, permanent.
* Affinity [26]. The parties are related by marriage in a prohibited degree. Ecclesiastical, relative, permanent.
* Public propriety [27]. The parties are "related" by notorious concubinage. Ecclesiastical, relative, permanent.
* Adoption [28]. The parties are related by adoption. Ecclesiastical, relative, permanent.
* Spiritual relationship [29]. One of the parties is the godparent of the other. This no longer applies in the Latin Rite.