yeah thats also what I would think I could say "look I dont have a way to prove she isnt.. but I'm not trying to get an extra person in here.. how bout I pay the difference for the cost"
If she were 18 or younger, then you wouldn't be willing to pay adult prices. Offering to do so would only give away the fact that the 19 year old is not a child. I would stick with the no ID story, I'm sure it will work.
Yeah, I'm sure they'll work with ya. Enjoy the game! It's going to be a night to remember...GO DUCKS!!!!