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although I agree that a person can change I have never know a narcissistic person to change. these people are parasites, they have learnt early that feeding off other peoples kindness is an easy boost for them. so they never have a motive to change.

Critical introspection is difficult for a narcissist, that is why it is rare for them to change. They actively avoid the kind of thinking that would allow them to recognize their own faults, and therefore be motivated to remove them. However 'difficult' and 'rare' are not synonyms of 'impossible' and 'never'.

Once a narcissist does recognize their problems and has a desire to change, they can find greater success in doing so than most of the other PD's.

The older they become, the worse it gets.

Narcissist have a good chance to get cured when they are getting help by psychologists. In reality most of them won't seek professional help. Instead they will suffer from becoming old.

Especially their self-esteem gets more and more damaged by not looking young and "perfect" anymore. They are lacking of efficiency as well.

When they realise that their lifetime will end without them being able to fill the emptyness inside their heart they become badly cold-hearted.