The Messenger of Allah ﷺ had hair that reached down to his shoulders.
أن رسول الله ﷺ كان يضرب شعره منكبيه.
No references are available.
Bukhari narrated it in the Book of Dress (5903, 5904), and Muslim narrated it in the Book of Virtues (2338:95), both of them via Qatada, from Anas, who said, and he related it.