Today is James and Oliver Phelps' 29th birthday – or should we say Fred and George Weasley's birthday (RIP Fred)! After all, the guys will never escape their iconic roles in the Harry Potter films. We just can't get over the fact that the first movie in the franchise came out nearly 15 years ago! Everyone at Hogwarts was so young back then.

Click through the gallery to see then-and-now pics of the cast of the movie, then let us know in the comments below who you think looks the most different. Are you a Potterhead?