E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Grey hairs. The Preacher thus describes old age:
In the day when the keepers of the house (the hands) shall tremble, and the strong men (the legs) bow themselves, and the grinders (the teeth) cease because they are few and those that look out of the windows (the eyes) be darkened and the almond-tree shall flourish (grey hairs on a bald pate), and the grasshopper be a burden, and desire shall fail when the silver cord (the spinal marrow) shall be loosed, the golden bowl (intellect) broken, and the pitcher broken at the cistern (the pulse of the heart stopped).Eccles. xii. 36.