I know of an American widow who travels regularly to Afghanistan to help people who live there.
Her hair is gray, too.
But when she walks into a room of young people, they all stand up. Their respect is real; she has survived to an age that most of them will not. The World Health Rankings say that people of Afghanistan can expect to live to about 60. In the US, life expectancy is closer to 80, particularly for women.
I like thinking of gray hair as something to desire rather than something to fear.