Sexual intercourse with a girl, despite the fact that the girl might have agreed to engage in the sexual activity, is considered as rape below which of the following age?

With or without the consent of a woman the sexual intercourse under 16yrs is considered as rape (Rape IPC 375). This concept called Statutory Rape makes sexual intercourse with a girl below a statutorily defined age, a rape, despite the fact that the girl may have agreed to engage in the sexual activity.