They seem to lose their looks faster than brunettes and red heads.
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Hair color has no bearing on whether someone age faster or not. Skin color does, but not hair color.
If you notice that blondes age faster then I'm sure them being blonde isn't the reason for that (correlation does not imply causation) but its probably because blondes tend to put themselves in predicaments where they are exposed to the sun's UV rays more, such as tanning.0