English: Rabbi Chama son of Rabbi Chanina said: From the days of our ancestors the yeshivah never ceased among them; Yitzchak was old and sitting in the yeshivah, as it is said “When Yitzchak was old.”
On the daf / in context: “Zaken” is read not only as chronological age but as the status of one who has acquired wisdom and sits in the academy, continuing the unbroken chain of Torah study among the Patriarchs.
Type of Learning
Custom (Bavli — continuous yeshivah of the Patriarchs)
What Is Learned
The Patriarchs maintained an unbroken yeshivah; “Yitzchak was old” is taken as evidence that he sat and taught in the academy.