question #2 Sahih al-Bukhari 3462, Book 60, Hadith 129 : How does personal grooming, such as dyeing hair, relate to religious identity in Islam?

Allah’s Messenger (ﷺ) said, “The Jews and the Christians do not dye (their grey hair), so you shall do the
opposite of what they do (i.e. dye your grey hair and beards).