From Sahih Muslim (Hadith 6073):
Ibn Sirin reported:Anas b. Malik was asked whether Allah's Messenger (ﷺ) dyed his hair. He said: He had not become old enough to have white hair. Ibn Idris said that he had a few white hair. Abu Bakr and Umar, however, dyed hair with hina' (henna)
Reference: Muslim 6073