Reference for Ketubot 34:10

ורב הונא מתניתין אתא לאשמועינן איבעית אימא רב הונא דיוקא דמתני' קאמר ואיבעית אימא אפילו הגדיל קמ"ל

But does R. Huna comes to teach [what is already taught In] our Mishnah! If you wish you may say, R. Huna says what is to be derived from our Mishnah by implication. And if you wish, you may say, “He teaches us, even if he had become of age.”

Jastrow