Jaabir bin Samurah R.A. was asked:
"Were there any white hair in the blessed head of Rasulullah (Sallallahu alaihe wasallam)? He replied: 'He only had a few on the middle parting, and when Rasuullah (Sallallahu alaihe wasallam) oiled his hair, they did not show'". (JA)
English reference (JA): Book 5, Hadith 43 (JA)
Arabic reference (JA): Book 5, Hadith 44 (JA)