Muhammad married Aisha, his third wife, when she was about age six, Some mainstream Islamic scholars have suggested that it is not the chronological age that matters; marriageable age under Muslim religious law is the age when the guardians of the girl feel she has reached sexual maturity.
Such determination of sexual maturity is a matter of subjective judgment, and there is a strong belief among most Muslims and scholars, based on Sharia, that marrying a girl less than 13 years old is an acceptable practice for Muslims.
This practice creates an economic incentive where girls are sought and married early by her family to the highest bidder.
Child marriages of girls is a way out of desperate economic conditions, or simply a source of income to the parents.
The practice began to be questioned in the 20th century, with the age of individuals' first marriage increasing in many countries and most countries increasing the minimum marriage age.
Russian Ladies are mostly of the orthodox Christian religion.
Persecution and displacement of Roma and Jewish people in Europe, colonial campaigns to get slaves from various ethnic groups in West Africa across the Atlantic for plantations, Islamic campaigns to get Hindu slaves from India across Afghanistan's Hindu Kush as property and for work, were some of the historical events that increased the practice of child marriage before the 19th century.
This practice intensified after the Jewish community was expelled from Spain, and resettled in the Ottoman Empire.
Today, child marriage is still fairly widespread, particularly in developing countries, such as parts of Africa, The incidence of child marriage has been falling in most parts of the world.
The countries with the highest observed rates of child marriages below the age of 18 are Niger, Chad, Mali, Bangladesh, Guinea and the Central African Republic, with a rate above 60%.