I generally cut my own hair with clippers, and see a pile of my own hair build up before me in the process. Usually this is brown hair but somewhere between February and April a large bulk of it turned grey.
I was inclined to think it was down to the intense stress that the early part of this year has given me but it seems scientists generally disagree with the idea that stress causes grey hair, its an aging thing and presumably a coincidence when an increased onset coincides with a period of heavy stress, but there are still some who ask questions over the possibility that the underlying chemical processes of aging may also be triggered by stress.
Re: Can stress really cause (contribute to) whitening of the hair?: “stress “can probably contribute” to hair whitening in some genetically predisposed individuals”