أَخْبَرَنَا عَلِيُّ بْنُ حُجْرٍ، قَالَ أَنْبَأَنَا إِسْمَاعِيلُ، عَنْ حُمَيْدٍ، عَنْ أَنَسٍ، قَالَ كَانَ شَعْرُ النَّبِيِّ صلى الله عليه وسلم إِلَى نِصْفِ أُذُنَيْهِ ‏.‏

It was narrated from Anas that: The hair of the Prophet [SAW] came halfway down his ears. Translation Not Available

Book Ref: Sunan An Nisai Book 48 Hadith 5234
Web Ref:  Sunan An Nisai Vol 6 Book 48 Hadith 5236