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I don’t think there is a “dead giveaway”. Plenty of kids can pass as adults online and plenty of adults seem like kids online. And sometimes with stuff like word usage/grammar/etc you can’t tell if it’s a child or someone who doesn’t speak English very well or maybe an English-speaking adult who happens to type like that. There’s a lot of different people in the world.
Yeah seriously, every time someone makes a generalization online “that subreddit is all 12 year olds anyway”, “r/teenagers is mainly grown me”, it really bothers me because no, you’re just overconfident in estimating people’s ages from text