Musnad Ahmad 534:1

Hajjaj ibn Muhammad narrated to us, from Hurayz ibn Uthman, who said: We were young boys sitting with Abdullah ibn Busr, and he was one of the companions of the Prophet, may God bless him and grant him peace, and we did not know how to ask him. So I said: "Was the Prophet, may God bless him and grant him peace, an old man?" He said: "There were some white hairs in his lower lip hair (anfaqah)."