As an asexual person myself I'm very disappointed by some of the posts on this thread.
There seems to be a lot of conflating of talking about asexuality, and talking about sex, as in the act of sexual intercourse. These aren't the same at all. I of course completely agree that teaching about the latter should be done only by parents or by teachers with appropriate safeguarding, but its perfectly possible to say to even a young child "some people like men, some people like women, some people like both, some people like none". In my opinion certainly by age 14 a girl (or boy) should already have been taught atleast this.
Honestly the conflation of teaching about asexuality and teaching about sexual acts has the same logic to it that stopped for so many years teaching that gay people exist - that teaching a child that some men like other men, or that some women like other women, would somehow have to involve teaching them about the details of gay sex at an inappropriate age, or that this would somehow influence straight kids into identifying as gay. Please let's not make the same mistake again for this generation of ace people.
I wish there had been support for ace people like this when I was younger. I'm 23 now, but when I was younger there was absolutely nothing to tell me that asexuality even existed. I remember actually reading something about asexuality, maybe on tumblr or someplace, when I was around 12 years old (not an unusual age for aces to figure out our orientation), but since there wasn't family, friends or teachers there to back this up I didn't believe it was real. I spent years getting pressured to be attracted to men, and I didn't properly acknowledge myself as ace till I went to university and met people from the LGBT+ club when I was 19.
There's a lot of misconceptions and misinformation about asexuality on this thread, I would recommend to seek out ace websites and resources that will address some of these myths. But to address a couple of the common ones here:
"Ace people have hormone imbalances / are that way because of abuse" - these are some of the most harmful myths about asexuality, echoing the old ideas that gay people are mentally ill or are gay because of suffering CSA.
Hormones can ofcourse affect sex drive, but I think it would be extremely unlikely for someone to conclude they're asexual - an inborn sexual orientation - because of this. In my time in the ace community, a vast majority of people have been ace as long as they have been aware of their sexuality. Atleast in most circumstances, it's the way we are born just like people are born gay, Bi or straight, not a medical issue or a result of trauma.
"Ace people don't face any issues" - while certainly almost no ace person would compare our struggle to the much greater one of gay and Bi people, we live in a society where wanting and having (heterosexual) sex and relationships is not only normalised, but often pressured, and this creates a lot of problems for ace people in our lives.
"Why would an ace person have sex?" - I understand this can be a complicated topic to understand, which may contribute to some of the ideas upthread that there's some bad agenda behind people saying this. In reality though, within the ace community it's generally agreed that there are various reasons why an ace person might consensually have sex. This could include, for example, being in a relationship with a non-ace person and wanting to feel close to them even in the absence of sexual attraction, or ace people who have a libido (many do; its not the same thing as sexual attraction). Again, there's a lot of resources written by ace people explaining the nuances of this so I would recommend searching for them.