I was an explorer. That's still hard to say. I quit and it was really sad but now to the point.
We ALL carried pocket knives on and off shifts/events/etc.
Just those foldable ones, some of us had manual blades that we have to push out all the way and some of us had the blades that one little push and it popped out for you.
Our explorers as young as 15 carried them around everywhere they went. Except for school.
My brother is 15 and has maybe 3 of them.
Another explorer who is 16, usually has 4 of them on him at all times.
My friend who lives with me is 19 and he carries one at all times.
My brothers friends who are 15 carry them all the time.
I am the only person in the group who doesn't regularly carry one. A) I do not have my own at the moment and B) They are not easy to carry around while wearing skin tight jeans.
However, I do plan on going to buy my own tomorrow.
We use them for various things.
And our knives have various uses.
The knife I am going to get is going to have a window punch and a seat belt cutter.
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Just like those.
And yes, if circumstances arised then yes we would use them for self defense BUT we are trained to not go for our weapons immediately. We use our skills to try to deescalate the situation and if that doesn't work and they come at us then we are to use our fighting techniques. Never are we to go after someone or pull a knife to try to solve the situation.
So yes, I would allow a 16 year old to carry a pocket knife like in the link above for various reasons, given they were responsible enough.