I know women who are 25 who lie about their age. Many women just have paper mache security and are insane.
This isnt full proof. If he does something comparitively worse than misrepresenting his age, then she will PWN him. And on top of that he will ace himself by using this as a defence, and she will further escalate the situation by accusing him of checking up on her. You can't win with women.
I wouldn't be down with that, but you should keep your mouth shut just to see how long she keeps the lie going.
This is how I'm going to play it... I'm not going to mention anything but I'll state how important trust is in a relationship to see how long she holds out. Here's some bit of irony... she's an Asian Christian that goes to church regularly.
As long as they don't lie about how many d*cks they have sucked its ok with me. I eagerly await a reply. Don't disappoint me group.
This is why I love prudes. I normally get to these questions in the first hour of conversation. Women pretend to get offended and I casually dismiss them, only to have them lecture me on how I don't know them so I can't make assumptions. But I already know everything I need to, and the rest is me catering to their need for attention to detail which I excel in. They'll lie initially but tell you the truth eventually once you pass their "testing" criterias. Basically how much you can put up with them. I get the real answer within the first month, and if it's over a certain number, I'm gone.
If you really like her and you think the relationship might be going somewhere I wouldn't stress over this or play mindgames like lecturing her about how important trust is. If she likes you she'll tell you sooner or later.
Ask her what year she graduated from high school. You'll at least know if she plans on sticking with the lie with her answer.