I'd say narcissism is very present among young adolescents. They still have egocentric and superficial personalities and haven't matured fully. It can be an acute thing for that period, or it can extend during the rest of their lives, that depends how they will grow as persons.
for sure, but that's because teenagers tend to think that they're invincible and that all adults are idiots. Keep in mind they've only a few years with abstrarct thinking and its not fully develolped...partially explaining their short-term planning.
Honestly, I can pinpoint early...very early periods in my life where I knew the PD was devloping and evolving. I had a full personality exam as a kid, and my impulsive scores were through the roof. Just because a PD can't be diagnosed until 18 doesn't necessarily mean that a kid can sort of be pre-treated before the PD crystalizes...if nothing else too alleviate the extremity of the traits. Not to mention that it might 'plant the seed'...that the PD'd person might, in fact, actually develop a PD and they can get educated much earlier in life.