Narcissistic personality disorder has a bad effects to anyone either be young or old or adult.

The effects are not favorable to some people like denial and lies for anything.

Compulsive disorder and acts arrogant with no heart whatsoever.

It might cause from several factors in life like abuse and bad experience when the person grows up.

Some are hereditary factor.

I put the important links to explain in details about the real effects of Narcissistic in adult life.

These links are written by some experts that have real knowledge in the topic itself.

Narcissistic personality always get disturb with anything in their lives.

I considered it dangerous and self-centered individuals.

They loved to be praised in everything they do in their lives. And arrogant to show people the he/she is always right no matter what.

Hates to lose and willing to take risks to show that he or she is on top of everybody else in the world.

Brain injury can cause depression and emotional disturbance in the family.

I am not an expert but these links will answer all your questions about Narcissistic Wounds and it's effects.