Yes, I had a little fun with the title.
but before they turn into teens, so say from about 11 years of age to about 14 years
You can't be before teen and after it at the same time. (And the use of "so say" weakens the description.)
The description for teen is a bit better, though I still prefer nixing the "so say".
Was there previous discussion on this or ought the descriptions be modified to be clearer?
Edit: I do see this previous discussion. Is it time for reconsideration of some points?
Edit #2: Per the albeit limited dialog here, I have made changes. Most notably, I have removed the paragraphs about romantic/sexual "interest" in the other gender. If these are "age-specific" then that, as we have all seen by watching the news, has not as much to do with romantic/sexual desires and their expression than many would hope!
The tags are much more generally defined now than before.
I'm not the end-all-be-all of course, so if I have erred, please don't hesitate to correct my fallacy(ies)!