Mohammad married Ayesha at age 6 and consummated the marriage at age 9.  The Quran allows marriage of  prepubescent child (Sura 65:4).  And since Muslims believe that Muhammad was an example for mankind; therefore Islam allows child marriage.  In order to justify that; the Muslim Da'wa team lie about girls being married as a child in the Bible; Mary is one example. They find unreliable Catholic apocryphal sources. Al and David discuss this matter in more details.