I'm Ann. I'm English. I'm twelve. I was born on May 17 , 1991. I learn Chinese at Beijing No.3 Middle School. I have a good friend. Her name is Lucy. She is twelve, too. We are in the same   grade.  But we are not in the same class. I'm in Class Two, and she is in Class Three. We have the same Chinese teacher . Her name is Zhang Ying. We all like her. Lucy's parents are both English teachers in China. And she has a sister. Her name is Lily. She is only five years old. How old is Lily? She is  _  .
twelve three five I don't know