Child marriage is a formal marriage or informal union entered into by an individual before reaching the age of 18. The legally prescribed marriageable age in some jurisdictions is below 18 years, especially in the case of girls; and even when the age is set at 18 years, many jurisdictions permit earlier marriage with parental consent or in special circumstances, such as teenage pregnancy. In certain countries, even when the legal marriage age is 18, cultural traditions take priority over legislative law. Child marriage affects both boys and girls, though the overwhelming majority of those affected are girls, most of whom are in poor socioeconomic situations.