在英语对话中询问年龄，你可以使用以下几种表达方式：

1. How old are you？

2. What's your age？

3. May I ask how old you are？

4. Would you mind telling me your age？

5. Which year were you born？

6. What's the age of you？

7. Would you mind disclosing your age？

8. Would you like to tell me your age？

9. How old is he/she？

10. He/She is [number of years old] years old.

选择合适的问法可以使得对话更加礼貌和得体