Another thing is bothering me. Everyone is talking about these girls going through puberty at 16 or 17 and having a growth spurt, etc. As a teacher with many years teaching in high schools, I can tell you that it is not that easy to tell the female seniors from the freshmen (with boys, it's a different story, of course). There is not usually any great growth spurt in the later teen years. Maybe just an inch or two is enough to throw everything off jumpwise, I don't know, but if these girls are really going through puberty at 17 years old, that is pretty unusual.