Age isn't necessarily tied to maturity, but it helps. A person would argue the same thing with 17 and 18 year olds but that's why rush is thorough, or should be anyway. And that lack of maturity is why some girls get into lots of trouble in their freshman year. Presumably if a girl is sharp enough to be starting college at 16 she's got a grasp of all this, but I still contend that you should be more aware of a heightened need for social guidance.
And we all know that 25 in boy years is about 15 in girl years.