greyed

/G R EY1 D/
verb
  1. 1

    To become grey.

    โ€œMy hair is beginning to grey.โ€

  2. 2

    To cause to become grey.

  3. 3

    To turn progressively older, in the context of the population of a geographic region.

    โ€œthe greying of Europeโ€

  4. 4

    To give a soft effect to (a photograph) by covering the negative while printing with a ground-glass plate.

Source: https://en.wiktionary.org/wiki/grey, https://en.wiktionary.org/wiki/greyed