Nineteen or eighteen?

One reviewer said that she was nineteen when the movie was made. She was born early 1975 and the movie was released in early 1974. So yes, she was barely 19 when the movie was released but she must have been 18 during the filming, correct?

It does not matter, I just want the facts to be accurate. Eighteen is old enough as far as the law is concerned, regardless of what happens in the show.