My greying pattern matched yours fairly well. It seemed to slow in my mid-30's, but my beard continues a slow greying to this day. No idea if stress contributed but my brother has always worked in less anxiety-ridden jobs, and he's kept more of his hair in its original color.
I have determined grey hair is heavier than dark. I'm certain of this because while less of it grows at the top of my head, more has begun to grow from my ears, nose, and other regions which can only be explained by the effects of gravity. I expect eventually, my toe-nails will be quite cozy if somewhat unfashionable. Altogether now, "Eeeeewww!"
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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