Hello. I'm 25. I'm going grey.

What should I do about this? I've never been bothered by it but the more grey hairs I get, the more I start to think that I should dye my hair to cover the greyness. Should i grow old gracefully and accept the fact that I'll be completely grey by the time i get to 30, or should I embark on a lifetime of dying my hair, and worrying about my roots etc?

or, will i get sacked if I dye my hair green?