What is "grayed"

Usage examples of "grayed".

Her dark hair was only lightly grayed, and it was remarkably becoming.

His dark hair had grayed at the sides, and there were lines at the corners of his gray eyes, but he easily looked to be in his mid-forties, rather than his fifties.

Gray One was already teasing the older wolf mercilessly, romping around her grayed hindquarters and throwing himself on his back in the mud when Gray Shona nipped him smartly.