coat color change

I have a question about silver/grey doodles. I have read that they are born black and then they shed out to silver/grey. Does anyone out there know at what age do they start changing colors?? I have heard that some colors take up to two years to come through and completely change...is that true?? Smudge is a jet black 11 month old F2 goldendoodle. Suddenly in the past few months I have noticed ALOT of white hairs coming out in her coat, mostly on her shoulder blades and down her spine area....is she changing?? Just curious, I don't care either way what color she ends up, but it's kind of exciting to see what happens.

Thanx for any info anyone can offer ;)

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