When I was in high school, I knew a girl three years younger than me who was built almost like that. It happens.
I do not argue. One of my classmates at age 14 looked like a 20-year-old model of erotic magazines.
This conversation reminds me of a while back, some stupid show about people living in like Alaskan wilderness or something was on when I walked past the TV. Saw these two girls, and the screen had some notation on it about how they were a pair of 13 year old and a 20 year old sisters or somewhere in those ball parks. Whatever it was, one was clearly underage, the other not. So based on their appearances I put two and two together, this one must be the younger sister and that one's the older sister...
Nope. The adult looked like a child, and the child looked like an adult, according to the next scenes notation pointing out that the younger looking one was actually the adult. That was one moment I remember pretty vividly where I was just like "Do I need to start asking people for ID out there so I don't go to fuckin' jail?"