The 17-year-old boy has been arrested for the incident that took place yesterday.
The old woman had filed a rape complaint against the teenager from the same village and police registered a case after a medical report confirmation, Timarni Subdivisional Officer of Police, Shesh Narayan Tiwari told reporters.
The boy sexually assaulted the woman at her house, police said adding that he was booked under various sections of the IPC.