Mahabharata 5.149.12

वयसा शास्त्रतो धैर्यात्कुलेनाभिजनेन चह्रीमान्कुलान्वितः श्रीमान्सर्वशास्त्रविशारदः

vayasā śāstrato dhairyātkulenābhijanena cahrīmānkulānvitaḥ śrīmānsarvaśāstraviśāradaḥ

Our plain-language meaning of this verse is waiting for scholar review.