WHAT'S THE YOUNGEST AGE HAVE SOMEONE YOU KNOW GOT PREGNANT?

My second oldest brother who was 22 years old got his girlfriend pregnant when she was 17 years old (but luckly she graduated from high school )while my third oldest brother got his girlfriend that was 20 years old pregnant when he was 14 years old.And now I have a handsome nephew that's 7 years old and a beautiful niece that's 2 years old.