יָשִׁישׁyâshîysh

aged, only Job (Job 15:10; Job 32:6; Job 29:8; Job 12:12)

Pronunciation: yaw-sheesh' · Hebrew/Aramaic (Old Testament) · H3453

Same root

יָשֵׁשׁyâshêsh · H3486gray-haired, i.e. an aged man
יְשִׁישָׁיYᵉshîyshây · H3454Jeshishai, an Israelite

Where it appears

Appears 4 times in the Bible.

Job 12:12 Wisdom belongs to the aged, and understanding to the old.
Job 15:10 On our side are aged, gray-haired men much older than your father!
Job 29:8 The young stepped aside when they saw me, and even the aged rose in respect at my coming.
Job 32:6 Elihu son of Barakel the Buzite said, “I am young and you are old, so I held back from telling you what I think.

Source: Brown, Driver and Briggs, Hebrew and English Lexicon of the Old Testament (1906), public domain; markup by unfoldingWord, CC BY (github.com/unfoldingWord/Brown-Driver-Briggs-Enhanced).