Sue is 15 years old.So she is elder than the sister who are 14 years old.这句话有语法错误吗?定语从句对吗?

题目

Sue is 15 years old.So she is elder than the sister who are 14 years old.这句话有语法错误吗?定语从句对吗?

答案

句末改为 who is 14 years old