From Sahih Muslim (Hadith 6080):
Abu Juhaifa reported:I saw Allah's Messenger (ﷺ) having some whiteness (in hair) at this place, and Zuhair placed one of his fingers at his chin. Juhaifa was asked how old he had been at that time. He said: I made arrows and put feathers to them (i. e. I had passed my childhood)
Reference: Muslim 6080