when a person remains foolish and lacks wisdom even after reaching the age of forty, it strongly signifies their inherent foolishness that is unlikely to be corrected.
ضرب المثل ) یعنی کسیکه تا چهل سالگی پخته نشود ( از نظر عقلی ) دیگه هرگز تا آخر عمرش نخواهد شد.
