女&男 both seem age specific since there is a の子 ver for both. So is it safe to
say 女性/男性 are what I would say if I was referring to the entire sex regardless
of age? Is that would would be put in officials bills concerning diff sexes?
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question
usage nuances
What is the official way to call females/males in the sex sense?
The concept, 'sex,' in Japanese would be 性別(せいべつ). The Japanese [Wikipedia
article](https://ja.wikipedia.org/wiki/%E6%80%A7%E5%88%A5) on the topic says:

> 性別（せいべつ、sex）とは、男性と女性の別。オスとメスの別。

So, depending on what you are referring to, it could be 男性 and 女性 or オス and メス
respectively. The article has a section that specifically addresses human sex.
I'll quote it here:

> 人間の場合はそれぞれを「男性」「女性」あるいは「おとこ」「おんな」や「男子」「女子」などと呼ぶ。

From this sentence, it would appear that 男性・女性, as well as おとこ・おんな and 男子・女子
are all acceptable for differentiating sex.

However, since you're asking what pair of words would be used on official
forms and the like, and for that it would be 男性・女性. For example, see this
online [Visa correction form](https://japan2.usembassy.gov/j/visa/tvisaj-form-
visacorrection.html).

You'll notice that item #4 性別 gives the options 男性 and 女性. I've also seen them
abbreviated to just 男 and 女 to save space on the page.
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answer