how old is your mother 回答用AT还是用About?

How old is your mother? How old is your mather How old is your father? How old is your father? How old is your g_______? how,is,your,old,friend How old is your father? How old is your son how old is your sister?she is 11 years old. 英语翻译How old is your cousin?不算 How old is your mother怎么回答 How old is your mother?回答句子 how,sister,old,is,your组句 How old is your brother 同义句 How old is your brother?回答 how old is your father怎么回答 连成一句话：old,is,aunt,how,your(?) How old is your father是什么意思