Whenever this topic comes up I just want to scream "does it fucking matter" in a most unladylike way.
I'm in my mid 50s and probably would have qualified as non-binary had I been a teenager in this century, except it's nonsense to me. I've always had the attitude that I have a particular meat suit with various attributes, some of which are irritating at times, but that's just the vehicle for "me". "Me" gives my biological self little attention, except in practical terms - have big boob's, wear a bra, used sanpro when needed, birthed a child, sweated through the menopause and am currently "enjoying" post meno invisibility, but hey ho, that's just my life.
Happy to declare my sex as what it objectively is - important from a medical perspective for example, but my feelings about it are trumped by being a person.
I've been patronised, marginalised, and had crap relationships because of society's obsession with gender stereotypes, and it drives me mad with incomprehension.
I still seethe with fury about the "protective" (translation controlling) behaviour and attitudes of some male relatives, such as my male cousin, who I went to see a film with when I was 18 and who virtually frog marched me onto a bus straight home rather than letting me go and have a drink in a pub where I wanted to meet friends, because he didn't want to go with me. It was so nice apparently that he "cared" but no, he was one month older than me and loved having the power because our parents all condoned it. Yes, I could have done my own thing, but the parental fallout would not have been worth it.
So I can't really help with the gender stuff because I donbeliwve in it. I'm an adult human female. That's it. Period.
Sorry for the ranty ramble but I'm just too old for this shit.