Their voices have long cracked, their skin is on the verge of breaking out, and the days are counting down to the time when one day Daniel Radcliffe will walk up to someone in a bar and offer to use his 'magic wand' on them. Yes those "Harry Potter" kids are growing up and the big question now is, how much longer can they last in the roles that made them famous.

Ananova reports that while the trio will all return for the fourth film "The Goblet of Fire" which is about to begin shooting, serious questions are now being raised about them doing a fifth movie as by the time that begins filming, they'll obviously be quite a bit older than their characters.

Producer David Heyman says "There will come a point when one, two, or all three of them will move on. I don't know when that will be - with the fifth, sixth or seventh movies - but it's inevitable". 'Azkaban' Director Alfonso Cuaron however would be keen on keeping all the kids around - "It would be amazing to have the whole series with the same kids. Right now they're doing No. 4. There's only three more to go. I just hope they keep the same cast for the whole thing. So far, they're holding up very good, the way that they are aging. I don't think Dan is going to get way much taller or suddenly grow another eye. Same with Emma, and Rupert is OK. Let's hope. In the last one they're supposed to be 17. Say they're 19, I think they're going to be very good".

Cuaron confirmed he'd also love to come back for another go in the director's chair of a Harry Potter movie - "I would love to come back. My dream is that the cast would remain intact".

Thanks to 'Scarrie'