I'm 2 years 7 months in to my medical MtoF transition. Recently I've noticed that my beard shadow seems darker. I'm in my late fifties and before HRT there was a noticeable amount of grey in my beard and my testosterone level had gotten quite low, well below the bottom number for a healthy male and closer to the top level for a healthy female. Could those grey hairs be turning dark again? Mind you, I have noted slower growth and some reduction in coverage.