Grey Panther
(US Gray Panther) originally US
noun
(In plural) an activist organization in the United States which seeks to promote social justice and the interests and rights of the elderly; (in singular) a member of this organization; (more generally) (chiefly with lower-case initials) an elderly person who is politically or socially active, especially in support of the rights of the elderly.
Origin
1970s; earliest use found in The Los Angeles Times. After black panther.