“That was long ago” doesn’t apply to narcissists. Narcissists don’t improve. They may refine their techniques, they may become harder to catch, but they don’t become less malicious or toxic. Information about what a narcissist was like 10, 20, or 50 years ago is still relevant today.
Be doubly careful if the narcissist herself is the one trying to convince you that something is old news and doesn’t matter. Narcissists are prone to say that about things that happened ten minutes ago if it serves their purpose; it doesn’t have anything to do with the truth. In fact, it’s a red flag that you’re onto something.
Don’t give them money or personal information. Regardless of how much (they say) they need it.
Don’t underestimate them. Narcissists have a single goal in life–their self-image. If they’re successful, they have networks of followers and dupes to give them money and aid in whatever they choose to do. If they’re unsuccessful, they are unencumbered by drains on their time and energy in the shape of friends, family, and work, and can spend 100% of their time and energy on getting revenge and digging up a fresh band of followers.