RobH_en_tn/job/12/12.md

With aged men is wisdom

"Aged men have wisdom." The abstract noun "wisdom" can be expressed with "wise." The word "men" refers to people in general. AT: "Old people are wise" (See: rc://en/ta/man/translate/figs-abstractnouns and rc://en/ta/man/translate/figs-gendernotations)

in length of days is understanding

This represents people gaining understanding when they live a long time. The abstract noun "understanding" can be expressed with the phrase "understand much." AT: "people gain understanding when they live a long time" or "people who live a long time understand much" (See: rc://en/ta/man/translate/figs-abstractnouns)