Yes, I just meant how similar to saying you didn't know something was illegal isn't a viable defense, claiming you didn't know how old someone was isn't a viable defense as well.
There are apparently photos of her with Josh in an 18 and over club. So she very well may have had fake ID and was representing herself as older.
In some states that doesn't matter. I think that's what he was saying. She could lie and say she was older, but in the eyes of the law it makes no difference. I know that seems counter-intuitive, but that's the law. Easy entrapment with basically no legal recourse.