Ah, Hell. I've actually thought about using something on my head hair to return it to my look of 10 years ago but in the end have just left nature run its course. I keep myself pretty fit and shave every day - no beard for me. But if I did, I wouldn't dye the beard either.
At 66-years of age, I've got gray hair popping up in my head, my eyebrows, my pubes, and on my chest. It seems to be unavoidable.