Musnad Ahmad 534:11

Hasan ibn Musa narrated to us, Hariz narrated to us, he said: I said to Abdullah ibn Busr while we were young boys who did not yet comprehend knowledge: "Was the Messenger of Allah, may Allah bless him and grant him peace, an old man?" He said: "There were some white hairs on his *'anfaqah* (the tuft of hair between the lower lip and the chin)."