Well Alan Rickman in my opinion doesn't look 59 playing Snape. lol (or it could be cuz I hold a soft spot for him and choose to ignore his age lol) Alot also has to do with a hair style. If they give them haircuts/styles you'd usually see on kids that'll also help with making them look younger. (I'm a video production major lol) If they make up terms (the trio) that'll keep them on then that'd be best. Like the Friends cast was kinda all or nothing. Demand (ask) more of their time now...so they will be done sooner. It can be done. (not shootin this movie drives me crazy cuz I know how i'd have done it) lmfao!