[Mezzaluna]

I've read that the directors and producers are also factoring this into their thinking, and plan to keep the production going pretty much straight through.

Daniel Radcliffe, the actor, is shorter in stature than nearly all the other male student characters, but you're right that Rupert Grint (Ron Weasley), Matthew Lewis (Neville Longbottom) and Tom Felton (Draco Malfoy) have sprouted up. They still look like stringy teenagers though, IMHO.

Having taught in middle schools and high schools in recent years, I can tell you the kids are getting TALLER. In my last year I remember a good number of eighth grade girls at six feet and better- even a few of both sexes in sixth grade.