The only CA ones I've ever gotten were ones about my age (I'm pretty youthful looking), but I got countless numbers of irritating FO questions. My favorite as an FO was always
"So does the Captain ever let you fly, or are you just a backup if he gets sick?".

Always wanted to say
"Well, I fly when he's either too sick or too drunk to fly."

But yeah, I always said "I fly for <Insert Legacy here> Express". That usually takes care of any questions, and they get the gist of what you do.

Another one I liked was "So you're still learning how to fly the airplane?" "No ma'am, believe it or not, I have years upon years of experience."