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?

问题描述:

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?

句末改为 who is 14 years old