Thabit narrates: People asked Sayyiduna Anas bin Malik (may Allah be pleased with him): Did the Prophet (peace and blessings be upon him) have white hair? He replied: Allah Almighty did not make him appear old through white hair. There were not more than 17 or 18 white hairs in his blessed head and beard.
Hadith Referenceصحیح ابن حبان / كتاب التاريخ / 6292
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - «مختصر الشمائل» (38/ 31): ق.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح على شرط مسلم