As I was reading through the Rogue forums, something kept bothering me. The way people kept dismissing the latest writer's view on Rogue's age. He had hinted that Rogue was about twenty-three, give or take, due to Professor Xavier saying something about Rogue having, since the age of thirteen, been honing her skills in her powers since the age of thirteen for ten years. So, yes, I guess that makes twenty-three, unless I read something wrong, or I was slightly off with my numbers. Back to the point, people kept saying that this couldn't be possible since they fancy her to be in her late twenties or early thirties, but with this Blog, I think I might be able to convince some people to go with the writer's point of view on her age.
People say that it couldn't possibly have been a thirteen-year-old fighting Miss Marvel. I don't think it was a thirteen-year-old fighting Miss Marvel and beating Captain America either. I'd think that she was a fifteen-year-old, because that would match the way the artist had drawn her figure. The writer had never said that Rogue was thirteen when she was fighting the Avengers, only that she had trained for ten years since she was thirteen. For all we know, that ten years could've included a couple of years where Mystique was training her to be her protege, so that would make her fifteen, the right age for my estimate (Avengers Annual #10).
Also, she had to be a teenager because she lived in a normal household with Mystique and Destiny with her own room and everything, just like a normal teenager does (Uncanny X-Men #170).
And, why does the way her face and her hair was drawn look matronly in her first appearance in print? My argument was that she was a completely new character, and the writers didn't have a definite direction that they had wanted to take her in, so they had drawn her in a neutral way that you wouldn't be able to pinpoint an exact age, whether it be in her teens, or her thirties. They wanted her look to be versatile so then, in whatever direction they decided that they wanted to take Rogue in, they could take her there.. Hence, when she joined the X-Men, she was described as one of the youngest members on the team.  

I'm really sorry to cut this short, especially as you've put a lot of thought & work into it.  However, we already have a thread for Rogues age.