Was Selina 17 or 18?
When Gordan tells her that he told the school she was 18, she said April 23, which I took to
mean she wasn't 18 yet. In fact, assuming their relationship had been taking place in the
summer, she would have been a young 17. Gordon's facial expression was one of surprise
and dismay.
If Selina was 17 she was still a minor and her mother could have pressed charges against Gordon for
kidnapping. Also she would have had to consent to Selina going to school. This was quite a bombshell to have been dropped during the last five mnutes of the movie.