How to accept my hair greying at the age of 27?

So I have one white hair in my beard and I’m very insecure about it.

I have it cut when I notice it but I know more will come as the years go on.

I’m the youngest of my family and was very cute as a child, and because of my autism a lot of people still treat me as younger than I am, despite being in my mid to late twenties.

How can I go about being okay with greying hair and loosing my youth?