When's your birthday?/What day were you born?/What is your date of birth?
What month were you born?/What year were you born?
How old are you?/What's your age?
You look like you're in your twenties./You look twenty-something.
You look young for your age.
He looks a lot older than his years.
You could pass for twenty five.
I'm pushing fifty.
I'm over forty.
We're the same age./You're the same age as me.
If you're old, then I'm ancient.
What's your sign?
I don't pay attention to that stuff.
What's your Chinese astrological sign?
I was born in the year of the horse.
I'm a dragon.
A: What's your sign?
B: I don't know, I don't pay attention to that stuff.
A: What month were you born?
B: I was born in July.
A: Then you may be a Cancer or a Leo.