I am one of the 20 year old FOs at TSA. Cptn Ed asked me durring the interview do I think I'm old enough to work here. I told him yes. I had already taught for 6 months. Durring that time I had built over 600 hrs dual given. That was convincing enough. That and I had baout 160 hrs multi. Age doesn't matter unless thay specifically say must be 21 or older like Comair, Skywest, Pinnacle, and other. RAH even has a 23 age limit on the ERJ170. I think this is silly. It must be for cheaper insurance. If young guys can fly a 76 seater at HoJet they should be able to fly 76 seaters at RAH. I'm just saying. Age doesn't matter. Its all attitude and experience. Though I'm only 20 I've been in an aviation family and flying since I was 14.