When i am middle aged.为什么不用middle age呢?

When i am middle aged.为什么不用middle age呢? I was in junior middle school when I was sat the age of 13 他们谁是主语,谓语,宾语? middle age Hello,I am Jane.I am glad to s__ something about my friends with you.When I s__ middle school. I am a middle school I am in No.5 Middle Shool at their middle age when i am gone I am not comfortably middle class;I am uncomfortably middle class 求翻译, I am a middle school student now.I want to go to college in the future.When I grow up,I want to的翻译 the teacher said to a student:when i am in your age,you are only2,and when you are in my age,i'm41.Then how old are they now? WHO I AM WHEN I AM WITHOUT I am going to be a teacher when I ----middle school.A will finish B finishes C finished D finish 额、、可不可以说明为什么选这个答案呀 middle-age和middle-aged 一样吗 high middle age 的意思? 人到中年 AT MIDDLE AGE怎么样 When I am clean,I am black.When I am dirty,I am White. who i am when i am when you