Well, in truth, there’s a number of reasons why those annoying little grey hairs show themselves. So, let’s take a look at the main ones:

Age, my dear, age and genetics
Your mother was right; it does come to us all eventually. Grey hair is hair that no longer contains any pigment and as your body slows with age, so does your melanin production. Melanin is the pigment – a complex polymer, to be precise – that gives your hair its colour. And the rate at which you go grey naturally is genetic. So, don’t cry in front of the mirror, blame your parents (or grandparents).