An ID checker at CLE asked me my birthdate, and then acted like she didn't believe me when I told her; she studied my ID for several more seconds before finally handing it back. I'm no longer answering such questions, though; if they want, they can go get the TSA or a LEO, but it's none of their business, IMHO. (She also then asked where I was born--as I was using a passport as ID--which I didn't answer; I just stared at her until she gave my ID back to me).