We do indeed change over time and it can be dramatic.
At first there is an almost teenage-like fascination with the clothing but as we mature the feelings deepen and it is about the warmth of experiencing life as our core gender. We undergo a deeply profound metamorphosis which is more about internal identification than what we have on our bodies. The clothing then becomes just an outward manifestation of that joy rather than it's own reward. But we are not brought up as girls and hence must suffer our pubescent prat falls which will happen chronologically later than for a biological female. Once that phase is over we will be left with the adult transgender individual who is certain of who they are.
The options are greater today than ever which can add to our dilemma but I still prefer today over the past because the timeline and the method of treatment are both of our choosing with plenty of information at our disposal. We get to find our own path rather than have choices made for us by a society who, in the not too distant past, would have been even more hostile than they are today.