On my mother's side, everyone grays early, and they are all prone to heart disease.
Then on my dad's side, they all have or had thin hair or no hair. Dad reportedly had a good head of hair, but when he went into the service, it was shaved off. He kept the DI haircut for the rest of his life. So who knows how much hair he really had? Regardless -- Dad's family all has or had coronary artery disease. Dad himself died from a heart attack (his third).
So I guess it doesn't matter -- gray hair or no hair -- I'm screwed.