system
A chat on subreddit /r/NoStupidQuestions
human
Of course kids are people, too. But they're still kids. *They* don't think they're kids, but the truth of the matter is their brains haven't developed to the point to where they can understand 2nd and 3rd order effects of their decisions and can't comprehend the consequences of their actions like an adult (allegedly) can.

The worst part is you don't even realize how stupid you were as a kid until you're a *lot* older and look back at yourself like, "damn, I was *really* fucking stupid!"
gpt
I think their overall point is that a lot of adults use it as an excuse to treat them without any respect at all.

You can acknowledge that 14 years old is still a kid without being a dick to them.

As long as they're being respectful, they deserve respect back.

My older sister had a tendency to treat me as annoying no matter how I acted, which got irritating.

I think when a 14 year old asks if they're still considered a kid, I think what they're really asking is, "Am I worthy of respect?"

They may be simply wanting more independence.

They're still at the age where the idea of "kid" feels like they're not being taken seriously at all. I think there needs to be a balance of giving them more responsibility and sometimes even humoring them by affirming it from time to time.

I think when push comes to shove, yes they need to.be reminded they're a kid.

But for the sake of parenting, they also should be given increased responsibility and not talked down to. 

Treating them with respect and saying, "Hey, so you're not a kid huh? Do you wanna do something really adult?"

They'll be like "sure."

Teach them how to do taxes.

Show them the realities of being an adult, and do it nonchalantly.

"One day you're going to be expected to do this every year. Once you're 18. Paying your taxes is part of being an adult."

If they wince, then just say, "Hey, I thought you weren't a kid anymore." (Then let them be on their way)

If they're actually receptive, then encourage them to go even further. 

Just gently introduce them to the realities of being a grown up, while still allowing them to be a kid and make mistakes.