While I now see this was a hoax, the problem of adult-child marriage in Islam is very real.
"Attempt to stop child marriage in Saudi Arabia fails
...Muslim men will continue to marry girls under the age of 15 in Saudi Arabia.
...The push to raise the legal age of marriage to 15 was crushed after the Grand Mufti, Sheikh Abdulaziz Al al-Sheikh, the most senior religious authority in the country, ruled that Islam supports men marrying underage girls.
The Grand Mufti ruled that it’s acceptable for men to marry girls under the age of 15, despite strenuous efforts by human rights activists and the Saudi justice ministry to set 15 as a minimum age for brides in the kingdom.
Grand Mufti Abdulaziz declared there is nothing prohibiting Muslim men from marrying girls under the age of 15.
...For example, in 2011, Dr. Salih bin Fawzan, a prominent cleric and member of Saudi Arabia’s highest religious council, issued a fatwa asserting that there is no minimum age for marriage and that girls can be married “even if they are in the cradle.”
Most Muslim scholars in support of child marriage note that nowhere does Sharia (or Islamic law) set an age limit for marrying girls.
...For many Muslims, to condemn child marriage is to condemn Muhammad."
Attempt to stop child marriage in Saudi Arabia fails