Well that would be awkward. lol. Maybe it has to do with the fact when I was younger I had grey hair but it got darker as I got older. So maybe its that?
Are you sure it's grey and not a really ashy blonde? If it's grey when you look closely you'll see pure white hairs mixed in with whatever your natural color is.
My natural hair was an ashy grey kind of colour so it could be that but it got darker as I got older. It's on the underside of my hair so it's not that noticeable.
Happy Birthday bud! And don't worry about the hair situation, recessive genes usually have those effects, i was born blonde, and then in ages 7 to 12 my hair turned completely black, lolz.
When I was born I came out with nearly black hair that turned strawberry blonde then went to medium brown. >:/ Boring old medium brown. I'd take grey over this tbh