In the famous words of Chris Rock:
If a woman tells you she is 20, and looks 16, then she is 12.
If a woman tells you she 26, and looks 26, she is damn near 40.
Dude, don't worry about it. Are you two an item or something? Any possiblity for romance? She might be a couple of years older than you, and feels insecure about telling you. Robbing the cradle syndrome. Don't sweat it.
Ryan
