A reminder on the hair color: The Kinzo flashback in ep7 shows him with white hair in his 30s. Granted, this is all speculative since we don't know if the hair colors are merely aesthetic or not, but if Kinzo's hair went white early, Kyrie has white hair, and Battler is said to resemble Kinzo very closely, it's entirely possible that Battler's hair would've gone white in his 30s too, if not earlier.
A better question would be how his hairstyle changed, but that's such an incredibly minor matter that can be fixed with scissors.
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