Premature greying of hair is a condition where the hair strands have lost their pigmentation, at an age earlier than it normally would (prematurely). Premature greying is considered to have occurred if it presents in Asians before the age of 25, in Whites before the age of 20, and in Africans before the age of 30. In spite of the loss of pigmentation in the hair, it is called greying and not whitening because of the visual impression that is given by the mixture of the pigmented hair and white hair, which imparts it a grey shade. 

Watch the video to understand the causes, how to combat and treat premature greying of hair.