I counted no more than fourteen white hairs on the head and beard of the Messenger of Allah ﷺ.
حدثنا عبد الرزاق قال أخبرنا معمر عن ثابت
ما عددت في رأس رسول الله ﷺ ولحيته إلا أربع عشرة شعرة بيضاء
Its isnad is sahih, it previously appeared at 12440, and there it says, "twenty hairs."