How to ask someone's birthday politely, and the other person is an old man, how to ask in a low voice so that she can answer happily?

Ask each other first: How old are you?

The other party replied: * * years old.

Say it again: Wow, I really can't see it. You are in good spirits. Did you celebrate your birthday this year?

The other party said: Have you passed/failed?

Just ask: what month and date is that?

It's out. . . . .