I swear I wasn't scamming the system (I'm in my 30's and still in good shape lol), but I did get wheelchair service a few years ago because I passed out in the security line. It was super hot (I was a bit dehydrated) and I got a bit woozy and just passed out for a moment, next thing I knew I was surrounded by TSA and paramedics - after confirming I wasn't pregnant lol, they let me go ahead but in a wheel chair. So I was a bit embarrassed to get to the gate and then just stand up and walk on the plane lol.