If you hate grey hairs then the natural way to prevent grey hairs is using Amla paste & amla oil, because it is considered to be the best way to stop your shiny black hairs from turning grey.
Amla is known because of many benefits such as it helps in hair growth, removes dandruff and makes your hair strong & shiny. But the least known benefit is that it prevents grey hairs.
On regular intervals massage your scalp with amla oil, make sure that each hair is soaked in amla oil. There are other natural remedies which can be also used such as coconut oil, henna and eggs.
Grey hairs are an indication of low amounts of melanin which can be maintained through use of proper care of hairs. For example on each weekend make a paste by using egg whites and coconut oil and apply it on your hairs. Leave it for 30 minutes and then wash it.
Similarly use henna once a month while amla & coconut oil should be used regularly.