From yashesh; an old man -- (very) aged (man), ancient, very old.
see HEBREW yashesh
H3453. yashish
יָשִׁישׁ adjective aged, only Job (Late Hebrew once יָשִׁישִׁים old, venerable men, Levy Jastr); — absolute יָשִׁישׁ Job 15:10; plural יְשִׁישִׁים 32:6 2t.; — aged, as predicate adjective 32:6 (opposed to לְיָמִים צָעִיר); as substantive 15:10 ("" שָׂב); 29:8 (opposed to נערים); חָכְמָה בִּישִׁישִׁים 12:12 among aged men is wisdom ("" תְּבוּנָה יָמִים אֹרֶח).