This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The characteristic of being hoary.

n. The state of being hoary.

n. . The state of being hoary, whitish, or gray: as, the hoariness of age.

n. Moldiness.

n. great age (especially grey or white with age)

n. a silvery-white color

"Then he considered his beard and, seeing that the white hairs in it covered the black, bethought himself that hoariness is the harbinger of death."

oldness    white    whiteness