This is part of the Sunnah.

My husband has some white hairs on his beard can he do colour or heena on his beard

Men Clothing | March 6, 2014 4:54 am
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I’m 25 years old.I found some white hair in my beard.I am extremely worried about my career, no girl would marry me and organizations will not provide me job calling me an old person.Please if you can give me a solution.
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My would-be wife is asking me to shave off my beard right now and start growing it again after 5 to 6 years. Will it be shirk?