I am 37 and I don't have any yet. I think both my parents went grey later than average and I probably take after them. My mum got her first greys in her 40s but the spread has been quite slow. At 70 she still has a lot of brown in her hair.
My dad I remember him being pretty much fully white at 75, but at 50 he would have been more brown/Auburn with a only few greys.
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