
Quoting
cdwjava
Just a quick check of CA and federal case law with regards to our underage sex laws, it seems that the 9th Circuit has also found that a mistake of age is no excuse when we talk about children UNDER age 16.
People v. Hernandez, 393 P.2d 673, 677 (Cal. 1964), United States v. Gomez-Mendez, 486 F.3d 599, 603-04 (9th Cir. 2007) ... among others.
Granted, a true mistake of age defense does appear to be possible in instances where the victim is 16 or 17 (though it had better be pretty darn convincing ... picking her up at her high school might blow it), but it seems that if the victim is UNDER 16 the mistake of age defense falls flat.