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I've provided the context of what made me ask this question below, as it could
just be that I am misunderstanding the passage.

If I understand correctly, the first person is explaining that their friend
has a めがねコンプレックス because she was teased by one of her classmates about this
when she was younger(she is in high school now). The second person responds
saying that's childish (I believe referring to the complex). The third person
then responds saying they are just a kid so it can't be helped.

「あの子、めがねコンプレックスらしいからね。小さい頃、同級生の男子にからかわれたとかで」

「子供っぽい」

「 **実際子供なんだから** 仕方ない」

However, they are all in high school, admittedly the person they are
discussing is 1 year younger than them, so I'm not really sure that 実際子供 makes
sense unless I am misunderstanding things.
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2020-08-19T19:55:06.150
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2020-08-20T01:54:52.267
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question
meaning
Up until what age are you a 子供?
The definition of 子供/大人 is loose, and I don't think the third person said
実際子供なんだ with a specific age threshold in mind. See: [What's the difference
between 成人 and 大人?](https://japanese.stackexchange.com/q/2986/5010)

Here, I think 子供だ said by the third speaker refers to almost the same thing as
子供っぽい. I would interpret this exchange like this:

> "This (specific way of thinking) is childish."
>
> "But (we all know) she _is_ (always) a childish person."
CC BY-SA 4.0
2020-08-20T01:54:52.267
80240
2020-08-20T01:54:52.267
5010
80239
answer