This subject has been talked about a lot. I personally think when you turn gray is genetic. But like the Good Question stated, it can be stress AND genetic.
My dad was gray very early. By 30 he was almost all gray. I’ve been “highlighting” my hair since I was about 40. To be honest, I couldn’t even tell you what color my hair is anymore. I get it done every 3 months. It’s not all one color so when the gray starts to seep in, it’s not as noticeable. My dad dyed his hair for years. My mom didn’t turn gray until quite a bit later. My brother didn’t turn gray but he lost his hair.
The argument that men aren’t gray when they become president is that it’s “the age” they are when they take the job. That that’s when most of us start to turn gray anyway. Do you buy that? I think I do.
What about you? Did your parents gray early? Did you? Did they or you dye it? Does it bother you?