When I saw my first gray hair in my 40s, I started dying it. Unfortunately, my hair grows very fast. Would have to dye my hair every 4 weeks at the most. Complete dye job, not touch-up. After 2 or 3 months, I decided I had better uses for my tIme and money.
I'm almost 65 now and my hair is almost completely grey. And I'm proud of it.