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1·Did you forget how old you are?

你忘了自己多少岁吗？

2·How old are you, my dear friend?

亲爱的朋友，你几岁了？

3·I'm nine. How old are you?

我九岁。你几岁了？

4·How old is the old man?

这位老人有多大年龄了？

5·How old were you then?

你那时多少岁？

6·How old was the boy?

那个男孩几岁？

7·Look how old I look!

看我看起来多年老！

8·How old do I look?

我看起来是有多老？

9·How old was Bob when he started riding horses?

鲍勃几岁开始骑马？

10·How old was Du when she did a little research to solve the problem?

Du 在几岁时做了一些调查来解决这个问题呢？

多大

1·How old is she?

她有多大了？《牛津词典》

2·Assuming (that) he's still alive, how old would he be now?

假定他还活着，现在有多大年纪了？《牛津词典》

3·How old is your mother?

您母亲多大岁数了？

4·How old are these sea turtles?

这些海龟有多大了？

5·Can you tell me how old those lambs are?

你能告诉我那些羊羔有多大了吗？