dd1 is 13 and told us she was gay about 6 months ago.
She had been talking a LOT about gender issues, and to be honest I was relived she was gay and not trans, as that would have had lots of implications.
Everyone at school seems to be genderfluid/agender/pangender etc etc, and so on the one hand I wouldn't be surprised at a child of this age coming out with something that then changes.
But for dd I am 99% certain that she is gay. I know it was like a damn bursting tellling us, as we then had a whole week of gay jokes, rainbows etc etc, and it was obvious that is was a relief to be her real self.
We have talked about who she wants to tell when, and if she wants me to tell, and initially I think she would have told everyone in a big declaration, but in fact she didn't, and hasn't and now doesn't seem bothered. Wider family don't officially know, but it isn't a secret, and let's just say her being gay surprised no-one. Everyone at school knows.
Since those first few weeks, she has calmed down, and it isn't the issue at the front of her mind any more. So she still hasn't officially told people at home.
It would be a non issue in our family as my uncle is gay and married, but I am just following her lead.