Did anyone else hear that dramatic violin on the last page?
But seriously tho... Probably they are "genderless," or something else like "OMG, there are older nonbinary people, they just had to fit into heteronormative society instead of just being themselves, and this is a universal thing, and oh look, the reason you haven't heard about them throughout history is because they all join a secret society, a secret society that has never been leaked, because they are an order of Assassins who protect the world from the evil Templars oh wait wrong convoluted fictional conspiracy."