Why only teens?

The answer to this is very simple

Growing to teen gets really complicated

You don't know how will you react to different things

Easy things may seem complicated or complicated things may seem easy

Or you will just make easy things complicated or make complicate things more complicate

Well now you know even the author is teen.

Your preferences get changed a lot

Your behaviour gets change a lot

You never know if you turn out to be cringe to some other teen.