Ecclesiastes 12:3
In the day when the keepers of the house shall tremble, and the strong men shall bow themselves, and the grinders cease because they are few, and those that look out of the windows be darkened,
Cross-reference
Ecclesiastes 12:2 darkens the lights just before — together they form the complete picture of aging's onset.
Psalm 90:10 directly addresses lifespan and old age's toil — a strong thematic parallel to Ecclesiastes' aging metaphor.
Genesis 27:1 describes Isaac's dim eyes — directly matching Ecclesiastes' 'windows grow dim' as a sign of old age.
1 Samuel 3:2 notes Eli's dim eyesight — a specific Old Testament example of the failing eyes Ecclesiastes describes.
1 Kings 14:4 says Ahijah's eyes were dim with age — another direct parallel to Ecclesiastes' fading vision.
Psalm 102:23 describes broken strength and shortened days — mirroring the weakening body in Ecclesiastes.
Zechariah 8:4 pictures old people with staffs — a literal counterpart to Ecclesiastes' metaphorical old age.