I had that kind of moment, back when I was 40. So first there's that "fuck I'm getting old" feeling. And just as I'm getting past that, my beard starts slowly but steadily turning gray. For some reason my beard has always been a shade or two lighter than my dark blonde hair. But still, it was quite depressing to see it actually turn grey.
Hair's still going strong. Though there's noticeable grey in it. I'm the opposite of Lt. Grey is fine. Balding means Gilette.