greying
grey-ing
verb
The process of becoming grey in colour, especially referring to hair.
"Her hair is greying noticeably with age."
adjective
Describing hair or a person whose hair is turning or has turned grey.
"His greying temples gave him a distinguished look."
Thesaurus
Synonyms: grey, gray, neutral, achromatic, greyish, grayish, greyness, grayness, Zane Grey, intermediate, old, white-haired