One or more charges may be used to prosecute violations of a state's age of consent laws, such as statutory rape or the state's equivalent of that charge. also sets a minimum age for marriage to prevent child marriage.
This is true in some jurisdictions, even if both partners are themselves younger than the age of consent, and both parties could technically be prosecuted. Sexual relations with an individual under the state's mandated age of consent is deemed as statutory rape, since rape is generally defined as sex without the other's consent, and anyone under the age of consent does not have the ability to consent in the eyes of the law. However, the actual age is set by individual state laws.
In the United States, the age of consent is the legal age at which a person is considered mature enough to consent to sex.