an aged man is not equivalent to an old man; it connotes a man worn down by age; in this line "aged" does not convey the idea of improving with age. we are now presented with an image of a scarecrow, nothing inside and nothing much outside except the remnants of a garment. but it is an idea that is being made perceptible in an image; it is not the picture of an old man. an old man as a body is a paltry thing unless "soul clap its hand and sing." the image for the redemptive power of the soul (a very abstract idea) is clapping and singsing in praise and exaltation of something. the point i am trying to make is that although there is no picture of an old man, the words of the poem create visually vivid image of old age. they may be images of ideas, but they are also images of feelings and feelings about ideas.