Hello
Greying of hair is mostly a inherited problem.So if anyone in your family had early greying then its possible that it's passed on to you.
Early greying also happens when the there is a
vitamin deficiency and thryoid or pituitary problem.
To check for vitamin get your
Vitamin B12 and Vit D3 checked .get
thyroid profile checked to.
You can take tablets which contain
calcium pantothenate ,PABA ,biotin and cupric oxide supplements.
Hope this helps
Best
Dr Batul Patel
Www.Drbatul. com