At 16 you get an adult passport, I don't see why anyone would even think a 16 year old would be excluded from a pat down. If they feel there's a reason for it, then they will do it. They make the rules. Last year my grandson's friend flew with us on vacation. She forgot her driver's license, so had to have a pat down and her carryon bags opened and checked. She had to produce everything and anything to verify who she was. I was just happy she could get through the TSA check point.