Most of the time I'm clean shaven, but every few years I'll grow out a goatee (I dislike the feel of a full beard) for a few months before going back. A few years back during one of the outgrowth periods I noticed grey strands that were likely in my head hair for awhile as well but I never noticed since I keep it very short. While I debated about continuing to let it keep growing since it made my feel old, but I decided...fuck it...it was what it was.
Currently I have let it grow back out again and it is now close to 50/50 salt & pepper, but I've come to terms with middle age in many ways, which includes obvious outward signs like changing hair color. When I decide I no longer like it (and eventually I will) I will shave it for reasons other than the grey. I would never consider dying it. I do think it adds a sort of distinction to older men and they should accept and embrace it rather than fear or hide it. For the record I feel the same way about women as I find one with grey hair very sexy though it's taken some persuasion to convince my wife of this.