It's different. It really really is. You can make a 21 year old play a 19 year old on TV because they're pretty much in the same age range and they've already developed. Sarah Michelle Gellar did it for years on Buffy. She was like 21/22 when the show started and Buffy was only 16/17. But it is VERY difficult to pull off making a 16/17 year old play a 14 yeard old. (Tom Felton) He's going to look too too old for the part. Daniel Radcliffe might be okay because he's still in that age range. Only 15 when his character will be 14. Even then you can really notice in the movies that they don't look their age. If you watch CoS, and think to yourself how old these kids are suppossed to be, you'd never believe it. They don't look 12!!! Thye look 13/14 years old, how they really are. I just think it mught be harder to do then some people think.