英语询问年龄并回答问题

Question: How old are you?
Answer: I'm [age] years old.

How old are you? I'm 35.
Or, if you're asking someone else:
How old is he/she? He/She is 28.

Hey there! So, how old are you?
Me? Oh, let's see. I turned 30 last year, so I'm 31 now. It feels like just yesterday I was in my 20s, you know? Time flies, doesn't it?