"Dan Radcliffe had a gray wig. Rupert had a receding wig with little bits of gray in it"

uhm sorry, but they are around 37 or 38 in the Epilogue. Really wondering who came up with this Idea. I know some People are getting gray Hair early, but isn't this rare?
Imo it was really the best Idea ever that they did a Reshoot for the Epilogue. The Make Up looked so much better. Rupert looked really old at first