Ecclesiastes 12:3 employs metaphorical language to depict the inevitable decline that comes with aging. The "keepers of the house" trembling likely refers to the hands or arms, which may shake as one grows older. The "strong men" stooping can be seen as a metaphor for the legs or the body, which may lose their strength and begin to bend with age. The "grinders" ceasing because they are few is a poetic way to describe the loss of teeth, which can make eating difficult. Lastly, "those looking through the windows" growing dim is a metaphor for the eyes, which may lose their sharpness and clarity over time.
These images serve as a poignant reminder of the physical changes that accompany aging, prompting us to reflect on the fleeting nature of life. This passage encourages us to appreciate our physical abilities while we have them and to focus on nurturing our spiritual well-being. It also invites us to consider the wisdom and experience that come with age, urging us to seek deeper understanding and connection with God as we navigate the journey of life.