Reference for Bava Metzia 132:2

א"ל מר ינוקא ומר קשישא בני דרב חסדא לרב אשי הכי אמרי נהרדעאי משמיה דרב נחמן האי אסמכתא בזמניה קניא בלא זמניה לא קניא

Mar Yanuka and Mar Kashisha, the sons of R. Hisda,<span class="x" onmousemove="('comment',' Yanuka is derived from a root meaning youth, Kashisha, age. Accordingly, Rashi in Keth. 89b says that Mar Yanuka was the younger, and Mar Kashisha the older. Tosaf. in B.B. 7b, s.v. [H], reverses it: Mar Yanuka means a son born in R. Hisda's youth, Mar Kashisha, in his old age. ');">²</span>

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